ThinkCentre M78

Hardware Maintenance Manual

Machine Types: 1562, 1565, 1662, 1663, 1765, 1766, 2011, 2110,
2111, 2112, 2113, 2114, 2115, 3515, 4860, 4863, 4865, 4866, 4869,
5100, 10BN, 10BQ, 10BR, 10BS, 10BT, and 10BU
Note: Before using this information and the product it supports, be sure to read and understand Chapter 2
“Safety information” on page 3 and Appendix A “Notices” on page 193.

Fourth Edition (June 2014)

© Copyright Lenovo 2012, 2014.

LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration
“GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.
Contents

Chapter 1. About this manual . . . . . . 1 Printer problems . . . . . . . . . . . . 50

Important safety information . . . . . . . . . . 1 Serial port problems. . . . . . . . . . . 51
Software problems . . . . . . . . . . . 51
Chapter 2. Safety information . . . . . . 3 USB problems . . . . . . . . . . . . . 52
General safety . . . . . . . . . . . . . . . . 3 Diagnostics . . . . . . . . . . . . . . . . 53
Electrical safety . . . . . . . . . . . . . . . 3 Lenovo Solution Center . . . . . . . . . 53
Voltage-selection switch . . . . . . . . . . . . 5 UEFI diagnostic program . . . . . . . . . 53
Safety inspection guide . . . . . . . . . . . . 5
Handling electrostatic discharge-sensitive Chapter 6. Using the Setup Utility
devices . . . . . . . . . . . . . . . . . . 6 program . . . . . . . . . . . . . . . . 55
Grounding requirements . . . . . . . . . . . . 6 Starting the Setup Utility program . . . . . . . 55
Safety notices (multi-lingual translations) . . . . . 6 Viewing and changing settings . . . . . . . . 55
Using passwords. . . . . . . . . . . . . . 55
Chapter 3. General information . . . . 29
Password considerations . . . . . . . . . 56
Specifications . . . . . . . . . . . . . . . 29
Power-On Password . . . . . . . . . . 56
For machine types: 1562, 1565, 1662, 1663,
1765, 1766, 2011, 2110, 2111, 2112, 10BN, Administrator Password . . . . . . . . . 56
10BQ, and 10BR . . . . . . . . . . . . 29 Hard Disk Password. . . . . . . . . . . 56
For machine types: 2113, 2114, 2115, 3515, Setting, changing, and deleting a password . 56
4860, 4863, 4865, 4866, 4869, 5100, 10BS, Erasing lost or forgotten passwords (clearing
10BT, and 10BU . . . . . . . . . . . . 30 CMOS) . . . . . . . . . . . . . . . . 57
Lenovo programs . . . . . . . . . . . . . 30 Enabling or disabling a device . . . . . . . . 57
Accessing Lenovo programs on the Windows Selecting a startup device . . . . . . . . . . 58
7 operating system . . . . . . . . . . . 30
Selecting a temporary startup device . . . . 58
Accessing Lenovo programs on the Windows
Selecting or changing the startup device
8 operating system . . . . . . . . . . . 31
sequence . . . . . . . . . . . . . . . 58
Lenovo Support Web site . . . . . . . . . . 32
Enabling ErP LPS compliance mode . . . . . . 58
ICE performance mode . . . . . . . . . . . 59
Chapter 4. General checkout . . . . . 33
ICE thermal alert . . . . . . . . . . . . . . 59
Problem determination tips . . . . . . . . . . 33
Changing the BIOS settings before installing a new
operating system. . . . . . . . . . . . . . 60
Chapter 5. Troubleshooting and
diagnostics . . . . . . . . . . . . . . 35 Exiting the Setup Utility program . . . . . . . 60
Basic troubleshooting . . . . . . . . . . . . 35
Chapter 7. Symptom-to-FRU index . . 61
Accessing Control Panel on the Windows 8
operating system. . . . . . . . . . . . . . 36 Hard disk drive boot error . . . . . . . . . . 61
Power supply problems . . . . . . . . . . . 61
Troubleshooting procedure . . . . . . . . . . 36
Beep symptoms . . . . . . . . . . . . . . 61
Troubleshooting . . . . . . . . . . . . . . 37
POST error codes . . . . . . . . . . . . . 62
Audio problems . . . . . . . . . . . . 37
Miscellaneous error messages . . . . . . . . 64
CD problems . . . . . . . . . . . . . 39
DVD problems . . . . . . . . . . . . . 40 Undetermined problems . . . . . . . . . . . 65
Intermittent problems . . . . . . . . . . 41
Chapter 8. Locations . . . . . . . . . 67
Hard disk drive problems . . . . . . . . . 41
For machine types: 1562, 1565, 1662, 1663, 1765,
Keyboard, mouse, or pointing device 1766, 2011, 2110, 2111, 2112, 10BN, 10BQ, and
problems . . . . . . . . . . . . . . . 42 10BR . . . . . . . . . . . . . . . . . . 67
Monitor problems. . . . . . . . . . . . 44 Locating connectors, controls, and indicators
Networking problems . . . . . . . . . . 45 on the front of your computer . . . . . . . 67
Option problems . . . . . . . . . . . . 48 Locating connectors on the rear of your
Performance and lockup problems . . . . . 49 computer . . . . . . . . . . . . . . . 68

© Copyright Lenovo 2012, 2014 i

 Locating major FRUs and CRUs . . . . . . 68 Chapter 10. Replacing FRUs (machine
Looking up FRU information . . . . . . . 70 types: 2113, 2114, 2115, 3515, 4860,
Locating parts on the system board . . . . 71 4863, 4865, 4866, 4869, 5100, 10BS,
Locating internal drives . . . . . . . . . 72 10BT, and 10BU). . . . . . . . . . . 135
For machine types: 2113, 2114, 2115, 3515, 4860, Handling static-sensitive devices . . . . . . . 135
4863, 4865, 4866, 4869, 5100, 10BS, 10BT, and Installing or replacing hardware . . . . . . . . 135
10BU . . . . . . . . . . . . . . . . . . 73
Installing external options . . . . . . . . 135
Locating connectors, controls, and indicators
Opening the computer cover . . . . . . . 136
on the front of your computer . . . . . . . 73
Removing and reinstalling the front bezel . . 136
Locating connectors on the rear of your
computer . . . . . . . . . . . . . . . 74 Accessing the system board components and
drives . . . . . . . . . . . . . . . . 138
Locating major FRUs and CRUs . . . . . . 74
Installing or replacing a memory module . . . 139
Looking up FRU information . . . . . . . 76
Installing or replacing a PCI card . . . . . . 141
Locating parts on the system board . . . . 77
Installing or replacing the card reader . . . . 143
Locating internal drives . . . . . . . . . 78
Replacing the power switch unit . . . . . . 148
Chapter 9. Replacing FRUs (machine Replacing the battery . . . . . . . . . . 150
types: 1562, 1565, 1662, 1663, 1765, Replacing the hard disk drive . . . . . . . 151
1766, 2011, 2110, 2111, 2112, 10BN, Installing the solid state drive . . . . . . . 154
10BQ, and 10BR) . . . . . . . . . . . 79 Replacing the optical drive . . . . . . . . 156
Handling static-sensitive devices . . . . . . . 79 Replacing the heat sink and fan assembly . . 158
Installing or replacing hardware . . . . . . . . 79 Replacing the power supply assembly . . . 161
Installing external options . . . . . . . . 79 Replacing the microprocessor . . . . . . . 166
Removing the computer cover. . . . . . . 80 Replacing the system board . . . . . . . 169
Removing and reinstalling the front bezel . . 81 Replacing the cover presence switch . . . . 170
Installing or replacing a PCI card . . . . . . 82 Replacing the internal speaker. . . . . . . 172
Installing or replacing a memory module . . . 85 Replacing the thermal sensor . . . . . . . 174
Installing or replacing the optical drive . . . 87 Replacing the front audio and USB
Installing or replacing the card reader . . . . 89 assembly . . . . . . . . . . . . . . . 176
Replacing the power switch unit . . . . . . 93 Replacing the WiFi units . . . . . . . . . 178
Replacing the battery . . . . . . . . . . 97 Installing or removing the rear WiFi antenna . . 182
Replacing the power supply assembly . . . 98 Installing or removing the front WiFi
antenna . . . . . . . . . . . . . . . 184
Replacing the heat sink and fan assembly . . 100
Replacing the keyboard or mouse . . . . . 187
Replacing the microprocessor . . . . . . . 102
Completing the parts replacement . . . . . 187
Replacing the system board . . . . . . . 104
Replacing the primary hard disk drive . . . . 105 Chapter 11. Additional service
Replacing the secondary hard disk drive. . . 108 information . . . . . . . . . . . . . 189
Installing the solid state drive . . . . . . . 110 Security features . . . . . . . . . . . . . . 189
Replacing the front fan assembly . . . . . 111 Hardware-controlled passwords . . . . . . 189
Replacing the rear fan assembly . . . . . . 113 Operating system password . . . . . . . 189
Replacing the front audio and USB Vital Product Data . . . . . . . . . . . 189
assembly . . . . . . . . . . . . . . . 115
BIOS levels . . . . . . . . . . . . . . . . 189
Replacing the internal speaker. . . . . . . 116
Flash update procedures . . . . . . . . . . 189
Replacing the thermal sensor . . . . . . . 118
Flash update procedures . . . . . . . . . 190
Replacing the cover presence switch . . . . 120
Updating (flashing) the BIOS from your
Replacing the WiFi units . . . . . . . . . 122 operating system . . . . . . . . . . . . 190
Installing or removing the rear WiFi antenna . . 128 Recovering from a POST/BIOS update
Installing or removing the front WiFi failure . . . . . . . . . . . . . . . . 190
antenna . . . . . . . . . . . . . . . 129 Power management . . . . . . . . . . . . 191
Replacing the keyboard or mouse . . . . . 131 Advanced Configuration and Power Interface
Completing the parts replacement . . . . . 132 (ACPI) BIOS . . . . . . . . . . . . . . 191
Automatic Power-on features . . . . . . . 191

ii ThinkCentre M78 Hardware Maintenance Manual

Appendix A. Notices . . . . . . . . . 193 Trademarks . . . . . . . . . . . . . . . . 194
Television output notice . . . . . . . . . . . 194
European conformance CE mark . . . . . . . 194 Index. . . . . . . . . . . . . . . . . 195

© Copyright Lenovo 2012, 2014 iii

iv ThinkCentre M78 Hardware Maintenance Manual
Chapter 1. About this manual
This manual provides service and reference information for ThinkCentre® computers listed on the front cover.
This manual is intended only for trained service personnel who are familiar with Lenovo® computer products.

Before servicing a Lenovo computer product, be sure to read Chapter 2 “Safety information” on page 3.

Chapter 7 “Symptom-to-FRU index” on page 61 and Chapter 11 “Additional service information” on page
189 are not specific to any machine type. These chapters are applicable to all ThinkCentre computers.

For major FRU locations and Customer Replaceable Unit (CRU) identification, see Chapter 8 “Locations”
on page 67.

For FRU replacement instructions, see Chapter 9 “Replacing FRUs (machine types: 1562, 1565, 1662, 1663,
1765, 1766, 2011, 2110, 2111, 2112, 10BN, 10BQ, and 10BR)” on page 79 and Chapter 10 “Replacing FRUs
(machine types: 2113, 2114, 2115, 3515, 4860, 4863, 4865, 4866, 4869, 5100, 10BS, 10BT, and 10BU)” on
page 135.

For FRU part numbers, go to:

http:/www.lenovo.com/serviceparts-lookup

Important safety information

Be sure to read all caution and danger statements in this manual before performing any of the instructions.

Veuillez lire toutes les consignes de type DANGER et ATTENTION du présent document avant d'exécuter
les instructions.

Lesen Sie unbedingt alle Hinweise vom Typ "ACHTUNG" oder "VORSICHT" in dieser Dokumentation, bevor
Sie irgendwelche Vorgänge durchführen

Leggere le istruzioni introdotte da ATTENZIONE e PERICOLO presenti nel manuale prima di eseguire una
qualsiasi delle istruzioni

Certifique-se de ler todas as instruções de cuidado e perigo neste manual antes de executar qualquer
uma das instruções

Es importante que lea todas las declaraciones de precaución y de peligro de este manual antes de seguir
las instrucciones.

© Copyright Lenovo 2012, 2014 1

2 ThinkCentre M78 Hardware Maintenance Manual
Chapter 2. Safety information
This chapter contains the safety information that you need to be familiar with before servicing a computer.

General safety
Follow these rules to ensure general safety:
• Observe good housekeeping in the area of the machines during and after maintenance.
• When lifting any heavy object:
1. Ensure you can stand safely without slipping.
2. Distribute the weight of the object equally between your feet.
3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.
4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the
muscles in your back. Do not attempt to lift any objects that weigh more than 16 kg (35 lb) or objects
that you think are too heavy for you.
• Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe.
• Before you start the machine, ensure that other service representatives and the customer's personnel are
not in a hazardous position.
• Place removed covers and other parts in a safe place, away from all personnel, while you are servicing
the machine.
• Keep your tool case away from walk areas so that other people will not trip over it.
• Do not wear loose clothing that can be trapped in the moving parts of a machine. Ensure that your sleeves
are fastened or rolled up above your elbows. If your hair is long, fasten it.
• Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, approximately
8 centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.
Remember: Metal objects are good electrical conductors.
• Wear safety glasses when you are: hammering, drilling, soldering, cutting wire, attaching springs, using
solvents, or working in any other conditions that might be hazardous to your eyes.
• After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device
that is worn or defective.
• Reinstall all covers correctly before returning the machine to the customer.

Electrical safety

CAUTION:
Electrical current from power, telephone, and communication cables can be hazardous. To avoid
personal injury or equipment damage, disconnect the attached power cords, telecommunication
systems, networks, and modems before you open the centre covers, unless instructed otherwise in
the installation and configuration procedures.

Observe the following rules when working on electrical equipment.

© Copyright Lenovo 2012, 2014 3

Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft
material that does not insulate you when working with live electrical currents. Many customers have, near
their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges.
Do not use this type of mat to protect yourself from an electric shock.
• Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical
accident occurs, you can then operate the switch or unplug the power cord quickly.
• Do not work alone under hazardous conditions or near equipment that has hazardous voltages.
• Disconnect all power before:
– Performing a mechanical inspection
– Working near power supplies
– Removing or installing Field Replaceable Units (FRU)
• Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer
to power-off the wall box that supplies power to the machine and to lock the wall box in the off position.
• If you need to work on a machine that has exposed electrical circuits, observe the following precautions:
– Ensure that another person, familiar with the power-off controls, is near you.
Remember: Another person must be there to switch off the power, if necessary.
– Use only one hand when working with powered-on electrical equipment; keep the other hand in your
pocket or behind your back.
Remember: There must be a complete circuit to cause an electric shock. By observing the above
rule, you may prevent a current from passing through your body.
– When using a tester, set the controls correctly and use the approved probe leads and accessories for
that tester.
– Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as
metal floor strips and machine frames.
Observe the special safety precautions when you work with very high voltages; these instructions are in
the safety sections of maintenance information. Use extreme care when measuring high voltages.
• Regularly inspect and maintain your electrical hand tools for safe operational condition.
• Do not use worn or broken tools and testers.
• Never assume that power has been disconnected from a circuit. First, check that it has been powered-off.
• Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors,
nongrounded power extension cables, power surges, and missing safety grounds.
• Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is
conductive; such touching can cause personal injury and machine damage.
• Do not service the following parts with the power on when they are removed from their normal operating
places in a machine:
– Power supply units
– Pumps
– Blowers and fans
– Motor generators
and similar units. (This practice ensures correct grounding of the units.)
• If an electrical accident occurs:
– Use caution; do not become a victim yourself.
– Switch off power.
– Send another person to get medical aid.

4 ThinkCentre M78 Hardware Maintenance Manual

Voltage-selection switch
Some computers are equipped with a voltage-selection switch located near the power-cord connection
point on the computer. If your computer has a voltage-selection switch, ensure that you set the switch to
match the voltage available at your electrical outlet. Setting the voltage-selection switch incorrectly can
cause permanent damage to the computer.

If your computer does not have a voltage-selection switch, your computer is designed to operate only at the
voltage provided in the country or region where the computer was originally purchased.

If you relocate your computer to another country, be aware of the following:

• If your computer does not have a voltage-selection switch, do not connect the computer to an electrical
outlet until you have verified that the voltage provided is the same as it was in the country or region
where the computer was originally purchased.
• If your computer has a voltage-selection switch, do not connect the computer to an electrical outlet until
you have verified that the voltage-selection switch is set to match the voltage provided in that country
or region.

If you are not sure of the voltage provided at your electrical outlet, contact your local electric company or
refer to official Web sites or other literature for travelers to the country or region where you are located.

Safety inspection guide

The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on these
products. Each machine, as it was designed and built, had required safety items installed to protect users
and service personnel from injury. This guide addresses only those items. However, good judgment should
be used to identify potential safety hazards due to attachment of features or options not covered by this
inspection guide.

If any unsafe conditions are present, you must determine how serious the apparent hazard could be and
whether you can continue without first correcting the problem.

Consider these conditions and the safety hazards they present:

• Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal
electrical shock).
• Explosive hazards, such as a damaged CRT face or bulging capacitor
• Mechanical hazards, such as loose or missing hardware

The guide consists of a series of steps presented in a checklist. Begin the checks with the power off, and
the power cord disconnected.

Checklist:
1. Check exterior covers for damage (loose, broken, or sharp edges).
2. Power-off the computer. Disconnect the power cord.
3. Check the power cord for:
a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground
continuity for 0.1 ohm or less between the external ground pin and frame ground.
b. The power cord should be the appropriate type as specified in the parts listings.
c. Insulation must not be frayed or worn.
4. Remove the cover.

Chapter 2. Safety information 5

 5. Check for any obvious alterations. Use good judgment as to the safety of any alterations.
6. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or
other liquids, or signs of fire or smoke damage.
7. Check for worn, frayed, or pinched cables.
8. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with.

Handling electrostatic discharge-sensitive devices

Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to
electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects.
Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the
person handling the part are all at the same charge.

Notes:
1. Use product-specific ESD procedures when they exceed the requirements noted here.
2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective.

When handling ESD-sensitive parts:

• Keep the parts in protective packages until they are inserted into the product.
• Avoid contact with other people while handling the part.
• Wear a grounded wrist strap against your skin to eliminate static on your body.
• Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even
when you are wearing a wrist strap.
• Use the black side of a grounded work mat to provide a static-free work surface. The mat is especially
useful when handling ESD-sensitive devices.
• Select a grounding system, such as those listed below, to provide protection that meets the specific
service requirement.

Note: The use of a grounding system is desirable but not required to protect against ESD damage.
– Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground.
– Use an ESD common ground or reference point when working on a double-insulated or
battery-operated system. You can use coax or connector-outside shells on these systems.
– Use the round ground-prong of the ac plug on ac-operated computers.

Grounding requirements
Electrical grounding of the computer is required for operator safety and correct system function. Proper
grounding of the electrical outlet can be verified by a certified electrician.

Safety notices (multi-lingual translations)

The caution and danger safety notices in this section are provided in the following languages:
• English
• Arabic
• Brazilian/Portuguese
• Chinese (simplified)
• Chinese (traditional)

6 ThinkCentre M78 Hardware Maintenance Manual

• French
• German
• Hebrew
• Italian
• Korean
• Spanish

DANGER

Electrical current from power, telephone and communication cables is hazardous.

To avoid a shock hazard:

• Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration
of this product during an electrical storm.
• Connect all power cords to a properly wired and grounded electrical outlet.
• Connect to properly wired outlets any equipment that will be attached to this product.
• When possible, use one hand only to connect or disconnect signal cables.
• Never turn on any equipment when there is evidence of fire, water, or structural damage.
• Disconnect the attached power cords, telecommunications systems, networks, and modems
before you open the device covers, unless instructed otherwise in the installation and configuration
procedures.
• Connect and disconnect cables as described in the following tables when installing, moving, or
opening covers on this product or attached devices.

To Connect To Disconnect
1. Turn everything OFF. 1. Turn everything OFF.
2. First, attach all cables to devices. 2. First, remove power cords from outlet.
3. Attach signal cables to connectors. 3. Remove signal cables from connectors.
4. Attach power cords to outlet. 4. Remove all cables from devices.
5. Turn device ON.

CAUTION:
When replacing the lithium battery, use only Part Number 45C1566 or an equivalent type battery
recommended by the manufacturer. If your system has a module containing a lithium battery, replace
it only with the same module type made by the same manufacturer. The battery contains lithium and
can explode if not properly used, handled, or disposed of. Do not:
• Throw or immerse into water
• Heat to more than 100°C (212°F)
• Repair or disassemble

Chapter 2. Safety information 7

Dispose of the battery as required by local ordinances or regulations.

CAUTION:
When laser products (such as CD-ROMs, DVD-ROM drives, fiber optic devices, or transmitters) are
installed, note the following:
• Do not remove the covers. Removing the covers of the laser product could result in exposure to
hazardous laser radiation. There are no serviceable parts inside the device.
• Use of controls or adjustments or performance of procedures other than those specified herein
might result in hazardous radiation exposure.

DANGER

Some laser products contain an embedded Class 3A or Class 3B laser diode. Note the following:

Laser radiation when open. Do not stare into the beam, do not view directly with optical
instruments, and avoid direct exposure to the beam.

≥18 kg (37 lbs) ≥32 kg (70.5 lbs) ≥55 kg (121.2 lbs)

CAUTION:
Use safe practices when lifting.

CAUTION:
The power control button on the device and the power switch on the power supply do not turn off
the electrical current supplied to the device. The device also might have more than one power
cord. To remove all electrical current from the device, ensure that all power cords are disconnected
from the power source.

2
1

8 ThinkCentre M78 Hardware Maintenance Manual

Chapter 2. Safety information 9
 ≥18 kg (37 lbs) ≥32 kg (70.5 lbs) ≥55 kg (121.2 lbs)

2
1

PERIGO

A corrente elétrica proveniente de cabos de alimentação, de telefone e de comunicações é perigosa.

10 ThinkCentre M78 Hardware Maintenance Manual

Para evitar risco de choque elétrico:
• Não conecte nem desconecte nenhum cabo ou execute instalação, manutenção ou reconfiguração
deste produto durante uma tempestade com raios.
• Conecte todos os cabos de alimentação a tomadas elétricas corretamente instaladas e aterradas.
• Todo equipamento que for conectado a este produto deve ser conectado a tomadas corretamente
instaladas.
• Quando possível, utilize apenas uma das mãos para conectar ou desconectar cabos de sinal.
• Nunca ligue nenhum equipamento quando houver evidência de fogo, água ou danos estruturais.
• Antes de abrir tampas de dispositivos, desconecte cabos de alimentação, sistemas de telecomunicação,
redes e modems conectados, a menos que especificado de maneira diferente nos procedimentos de
instalação e configuração.
• Conecte e desconecte os cabos conforme descrito na tabela apresentada a seguir ao instalar, mover ou
abrir tampas deste produto ou de dispositivos conectados.

Para Conectar: Para Desconectar:

1. DESLIGUE Tudo. 1. DESLIGUE Tudo.
2. Primeiramente, conecte todos os cabos aos 2. Primeiramente, remova os cabos de alimentação das
dispositivos. tomadas.
3. Conecte os cabos de sinal aos conectores. 3. Remova os cabos de sinal dos conectores.
4. Conecte os cabos de alimentação às tomadas. 4. Remova todos os cabos dos dispositivos.
5. LIGUE os dispositivos.

CUIDADO:

Ao substituir a bateria de lítio, utilize apenas uma bateria com Número de Peça 45C1566 ou um tipo
de bateria equivalente recomendado pelo Se o seu sistema possui um módulo com uma bateria de
lítio, substitua-o apenas por um módulo do mesmo tipo e do mesmo fabricante. A bateria contém lítio
e pode explodir se não for utilizada, manuseada ou descartada de maneira correta.

Não:
• Jogue ou coloque na água
• Aqueça a mais de 100°C (212°F)
• Conserte nem desmonte

Descarte a bateria conforme requerido pelas leis ou regulamentos locais.

PRECAUCIÓN:

Quando produtos a laser (como unidades de CD-ROMs, unidades de DVD-ROM, dispositivos de fibra ótica
ou transmissores) estiverem instalados, observe o seguinte:
• Não remova as tampas. A remoção das tampas de um produto a laser pode resultar em exposição
prejudicial à radiação de laser. Não existem peças que podem ser consertadas no interior do dispositivo.

Chapter 2. Safety information 11

• A utilização de controles ou ajustes ou a execução de procedimentos diferentes dos especificados aqui
pode resultar em exposição prejudicial à radiação.

PERIGO

Alguns produtos a laser contêm diodo de laser integrado da Classe 3A ou da Classe 3B. Observe o seguinte:

Radiação a laser quando aberto. Não olhe diretamente para o feixe a olho nu ou com instrumentos ópticos e
evite exposição direta ao feixe.

≥18 kg (37 lbs) ≥32 kg (70.5 lbs) ≥55 kg (121.2 lbs)

CUIDADO:

Utilize procedimentos de segurança para levantar equipamentos.

CUIDADO:

O botão de controle de alimentação do dispositivo e o botão para ligar/desligar da fonte de alimentação

não desligam a corrente elétrica fornecida ao dispositivo. O dispositivo também pode ter mais de um cabo
de alimentação. Para remover toda a corrente elétrica do dispositivo, assegure que todos os cabos de
alimentação estejam desconectados da fonte de alimentação.

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12 ThinkCentre M78 Hardware Maintenance Manual

Chapter 2. Safety information 13
2
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14 ThinkCentre M78 Hardware Maintenance Manual

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Chapter 2. Safety information 15

DANGER

Le courant électrique provenant de l'alimentation, du téléphone et des câbles de transmission peut présenter
un danger.

Pour éviter tout risque de choc électrique :

• Ne manipulez aucun câble et n'effectuez aucune opération d'installation, d'entretien ou de reconfiguration
de ce produit au cours d'un orage.
• Branchez tous les cordons d'alimentation sur un socle de prise de courant correctement câblé et mis à la
terre.
• Branchez sur des socles de prise de courant correctement câblés tout équipement connecté à ce produit.
• Lorsque cela est possible, n'utilisez qu'une seule main pour connecter ou déconnecter les câbles
d'interface.
• Ne mettez jamais un équipement sous tension en cas d'incendie ou d'inondation, ou en présence de
dommages matériels.
• Avant de retirer les carters de l'unité, mettez celle-ci hors tension et déconnectez ses cordons
d'alimentation, ainsi que les câbles qui la relient aux réseaux, aux systèmes de télécommunication et aux
modems (sauf instruction contraire mentionnée dans les procédures d'installation et de configuration).
• Lorsque vous installez, que vous déplacez, ou que vous manipulez le présent produit ou des périphériques
qui lui sont raccordés, reportez-vous aux instructions ci-dessous pour connecter et déconnecter les
différents cordons.

Connexion Déconnexion
1. Mettez les unités HORS TENSION. 1. Mettez les unités HORS TENSION.
2. Commencez par brancher tous les cordons sur les 2. Débranchez les cordons d'alimentation des prises.
unités. 3. Débranchez les câbles d'interface des connecteurs.
3. Branchez les câbles d'interface sur des connecteurs. 4. Débranchez tous les câbles des unités.
4. Branchez les cordons d'alimentation sur des prises.
5. Mettez les unités SOUS TENSION.

ATTENTION:

Remplacer la pile au lithium usagée par une pile de référence identique exclusivement, (référence
45C1566), ou suivre les instructions du fabricant qui en définit les équivalences. Si votre système est
doté d'un module contenant une pile au lithium, vous devez le remplacer uniquement par un module
identique, produit par le même fabricant. La pile contient du lithium et peut exploser en cas de
mauvaise utilisation, de mauvaise manipulation ou de mise au rebut inappropriée.

Ne pas :

• la jeter à l'eau,
• l'exposer à des températures supérieures à 100°C,
• chercher à la réparer ou à la démonter.

Ne pas mettre la pile à la poubelle. Pour la mise au rebut, se reporter à la réglementation en vigueur.

16 ThinkCentre M78 Hardware Maintenance Manual

ATTENTION:

Si des produits à laser (tels que des unités de CD-ROM, de DVD-ROM, des unités à fibres optiques, ou
des émetteurs) sont installés, prenez connaissance des informations suivantes :
• Ne retirez pas le carter. En ouvrant l'unité de CD-ROM ou de DVD-ROM, vous vous exposez au
rayonnement dangereux du laser. Aucune pièce de l'unité n'est réparable.
• Pour éviter tout risque d'exposition au rayon laser, respectez les consignes de réglage et
d'utilisation des commandes, ainsi que les procédures décrites dans le présent manuel.

DANGER

Certains produits à laser contiennent une diode à laser intégrée de classe 3A ou 3B. Prenez
connaissance des informations suivantes:

Rayonnement laser lorsque le carter est ouvert. Evitez toute expositiondirecte au rayon laser. Evitez
de regarder fixement le faisceau ou del'observer à l'aide d'instruments optiques.

≥18 kg (37 lbs) ≥32 kg (70.5 lbs) ≥55 kg (121.2 lbs)

ATTENTION:

Soulevez la machine avec précaution.

ATTENTION:

L'interrupteur de contrôle d'alimentation de l'unité et l'interrupteur dubloc d'alimentation ne coupent

pas le courant électrique alimentantl'unité. En outre, le système peut être équipé de plusieurs
cordonsd'alimentation. Pour mettre l'unité hors tension, vous devez déconnectertous les cordons
de la source d'alimentation.

Chapter 2. Safety information 17

2
1

VORSICHT

An Netz-, Telefon- und Datenleitungen können gefährliche Spannungen anliegen.

Aus Sicherheitsgründen:
• Bei Gewitter an diesem Gerät keine Kabel anschließen oder lösen. Ferner keine Installations-,
Wartungs- oder Rekonfigurationsarbeiten durchführen.
• Gerät nur an eine Schutzkontaktsteckdose mit ordnungsgemäß geerdetem Schutzkontakt
anschließen.
• Alle angeschlossenen Geräte ebenfalls an Schutzkontaktsteckdosen mit ordnungsgemäß
geerdetem Schutzkontakt anschließen.
• Die Signalkabel nach Möglichkeit einhändig anschließen oder lösen, um einen Stromschlag durch
Berühren von Oberflächen mit unterschiedlichem elektrischem Potenzial zu vermeiden.
• Geräte niemals einschalten, wenn Hinweise auf Feuer, Wasser oder Gebäudeschäden vorliegen.
• Die Verbindung zu den angeschlossenen Netzkabeln, Telekommunikationssystemen, Netzwerken
und Modems ist vor dem Öffnen des Gehäuses zu unterbrechen, sofern in den Installations- und
Konfigurationsprozeduren keine anders lautenden Anweisungen enthalten sind.
• Zum Installieren, Transportieren und Öffnen der Abdeckungen des Computers oder der
angeschlossenen Einheiten die Kabel gemäß der folgenden Tabelle anschließen und abziehen.

Zum Anschließen der Kabel gehen Sie wie folgt vor Zum Abziehen der Kabel gehen Sie wie folgt vor
1. Schalten Sie alle Einheiten AUS. 1. Schalten Sie alle Einheiten AUS.
2. Schließen Sie erst alle Kabel an die Einheiten an. 2. Ziehen Sie zuerst alle Netzkabel aus den
3. Schließen Sie die Signalkabel an die Buchsen an. Netzsteckdosen.

4. Schließen Sie die Netzkabel an die Steckdose an. 3. Ziehen Sie die Signalkabel aus den Buchsen.

5. Schalten Sie die Einheit EIN. 4. Ziehen Sie alle Kabel von den Einheiten ab.

CAUTION:

Eine verbrauchte Lithiumbatterie nur durch eine Batterie mit der Teilenummer 45C1566 oder eine
gleichwertige, vom Hersteller empfohlene Batterie ersetzen. Enthält das System ein Modul mit einer
Lithiumbatterie, dieses nur durch ein Modul desselben Typs und von demselben Hersteller ersetzen.
Die Batterie enthält Lithium und kann bei unsachgemäßer Verwendung, Handhabung oder Entsorgung
explodieren.

Die Batterie nicht:

• mit Wasser in Berührung bringen.

18 ThinkCentre M78 Hardware Maintenance Manual

• über 100 C erhitzen.
• reparieren oder zerlegen.

Die örtlichen Bestimmungen für die Entsorgung von Sondermüll beachten.

ACHTUNG:

Bei der Installation von Lasergeräten (wie CD-ROM-Laufwerken, DVD- aufwerken, Einheiten mit
Lichtwellenleitertechnik oder Sendern) Folgendes beachten:
• Die Abdeckungen nicht entfernen. Durch Entfernen der Abdeckungen des Lasergeräts können
gefährliche Laserstrahlungen freigesetzt werden. Das Gerät enthält keine zu wartenden Teile.
• Werden Steuerelemente, Einstellungen oder Durchführungen von Prozeduren anders als hier
angegeben verwendet, kann gefährliche Laserstrahlung auftreten.

VORSICHT

Einige Lasergeräte enthalten eine Laserdiode der Klasse 3A oder 3B. Beachten Sie Folgendes:

Laserstrahlung bei geöffneter Verkleidung. Nicht in den Strahl blicken. Keine Lupen oder Spiegel
verwenden. Strahlungsbereich meiden.

≥18 kg ≥32 kg ≥55 kg

ACHTUNG:

Arbeitsschutzrichtlinien beim Anheben der Maschine beachten.

ACHTUNG:

Mit dem Netzschalter an der Einheit und am Netzteil wird die Stromversorgung für die Einheit
nicht unterbrochen. Die Einheit kann auch mit mehreren Netzkabeln ausgestattet sein. Um die
Stromversorgung für die Einheit vollständig zu unterbrechen, müssen alle zum Gerät führenden
Netzkabel vom Netz getrennt werden.

Chapter 2. Safety information 19

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20 ThinkCentre M78 Hardware Maintenance Manual

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Chapter 2. Safety information 21

PERICOLO

La corrente elettrica proveniente dai cavi di alimentazione, del telefono e di comunicazione può essere
pericolosa.

Per evitare il rischio di scosse elettriche:

• Non collegare o scollegare qualsiasi cavo oppure effettuare l'installazione, la manutenzione o la
riconfigurazione del prodotto durante un temporale.
• Collegare tutti i fili elettrici a una presa di alimentazione correttamente cablata e dotata di messa a
terra.
• Collegare alle prese elettriche appropriate tutte le apparecchiature che verranno utilizzate per
questo prodotto.
• Se possibile, utilizzare solo una mano per collegare o scollegare i cavi di segnale.
• Non accendere assolutamente apparecchiature in presenza di incendi, perdite d'acqua o danno
strutturale.
• Scollegare i cavi di alimentazione, i sistemi di telecomunicazione, le reti e il modem prima di
aprire i coperchi del dispositivo, salvo istruzioni contrarie relative alle procedure di installazione e
configurazione.
• Collegare e scollegare i cavi come descritto nella seguente tabella quando vengono effettuate
operazioni di installazione, spostamento o apertura dei coperchi di questo prodotto o delle unità
collegate.

Per collegarsi Per scollegarsi

1. SPEGNERE le apparecchiature. 1. SPEGNERE le apparecchiature.
2. Innanzitutto, collegare tutti i cavi alle unità. 2. Innanzitutto, rimuovere i cavi di alimentazione dalla
3. Collegare i cavi di segnale ai connettori. presa.

4. Collegare i cavi di alimentazione alla presa. 3. Rimuovere i cavi di segnale dai connettori.

5. Accendere l'unità. 4. Rimuovere tutti i cavi dalle unità.

ATTENZIONE:

Quando si sostituisce la batteria al litio, utilizzare solo il Numero parte 45C1566 o un tipo di batteria
equivalente consigliato dal produttore. Se sul sistema è presente un modulo che contiene una batteria
al litio, sostituirlo solo con un tipo di modulo dello stesso tipo della stessa casa di produzione. La
batteria contiene litio e può esplodere se usata, maneggiata o smaltita in modo non corretto.

Non:
• Gettare o immergere la batteria nell'acqua
• Riscaldarla ad una temperatura superiore ai 100 gradi C (212 gradi F)
• Smontarla, ricaricarla o tentare di ripararla

Le batterie usate vanno smaltite in accordo alla normativa in vigore (DPR 915/82 e successive
disposizioni e disposizioni locali).

22 ThinkCentre M78 Hardware Maintenance Manual

ATTENZIONE:

Quando vengono installati prodotti laser (quali CD-ROM, unità DVD-ROM, unità a fibre ottiche o
trasmittenti), tener presente quanto segue:
• Non rimuovere gli sportelli. L'apertura di un'unità laser può determinare l'esposizione a radiazioni
laser pericolose. All'interno dell'unità non vi sono parti su cui effettuare l'assistenza tecnica.
• L'utilizzo di controlli, regolazioni o l'esecuzione di procedure non descritti nel presente manuale
possono provocare l'esposizione a radiazioni pericolose.

PERICOLO

Alcune unità laser contengono un diodo laser di Classe 3A o Classe 3B. Tener presente quanto segue:

Aprendo l'unità vengono emesse radiazioni laser. Non fissare il fascio, non guardarlo direttamente
con strumenti ottici ed evitare l'esposizione al fascio.

≥18 kg ≥32 kg ≥55 kg

ATTENZIONE:

Prestare attenzione nel sollevare l'apparecchiatura.

ATTENZIONE:

Il pulsante di controllo dell'alimentazione presente sull'unità e l'interruttore dell'alimentatore non

disattivano l'alimentazione corrente fornita all'unità. E' possibile che l'unità disponga di più cavi di
alimentazione. Per disattivare l'alimentazione dall'unità, accertarsi che tutti i cavi di alimentazione
siano scollegati dalla fonte di alimentazione.

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Chapter 2. Safety information 23

24 ThinkCentre M78 Hardware Maintenance Manual
2
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PELIGRO

La corriente eléctrica procedente de cables de alimentación, teléfonos y cables de comunicación puede

ser peligrosa.

Para evitar el riesgo de descarga eléctrica:

• No conecte ni desconecte los cables ni realice ninguna tarea de instalación, mantenimiento o
reconfiguración de este producto durante una tormenta eléctrica.
• Conecte todos los cables de alimentación a tomas de corriente debidamente cableadas y
conectadas a tierra.
• Cualquier equipo que se conecte a este producto también debe conectarse a tomas de corriente
debidamente cableadas.
• Siempre que sea posible, utilice una sola mano para conectar o desconectar los cables de señal.

Chapter 2. Safety information 25

• No encienda nunca un equipo cuando hay señales de fuego, agua o daños estructurales.
• Desconecte los cables de alimentación, los sistemas de telecomunicaciones, las redes y los
módems conectados antes de abrir las cubiertas de los dispositivos, a menos que se indique lo
contrario en los procedimientos de instalación y configuración.
• Conecte y desconecte los cables, como se describe en la tabla siguiente, cuando instale, mueva o
abra las cubiertas de este producto o de los dispositivos conectados.

Para conectar Para desconectar

1. APÁGUELO todo. 1. APÁGUELO todo.

2. En primer lugar, conecte todos los cables a los 2. En primer lugar, desenchufe los cables de alimentación
dispositivos. de las tomas de corriente.
3. Conecte los cables de señal a los conectores. 3. Desconecte los cables de señal de los conectores.
4. Enchufe los cables de alimentación a las tomas de 4. Desconecte todos los cables de los dispositivos.
corriente.
5. Encienda el dispositivo.

PRECAUCIÓN:

Cuando sustituya una batería de litio, utilice solamente una batería número de pieza 45C1566 u otra
de tipo equivalente recomendada por el fabricante. Si su sistema dispone de un módulo que contiene
una batería de litio, reemplácelo sólo con el mismo tipo de módulo, del mismo fabricante. La batería
contiene litio y puede explotar si no se utiliza, manipula o desecha correctamente.

No debe:
• Arrojarla al agua o sumergirla en ella
• Exponerla a temperaturas superiores a 100°C (212°F)
• Repararla o desmontarla

Deshágase de la batería según especifiquen las leyes o normas locales.

PRECAUCIÓN:

Cuando haya productos láser (como unidades de CD-ROM, unidades de DVD, dispositivos de fibra
óptica o transmisores) instalados, tenga en cuenta lo siguiente:
• No quite las cubiertas. Si quita las cubiertas del producto láser, podría quedar expuesto a radiación
láser peligrosa. Dentro del dispositivo no existe ninguna pieza que requiera servicio técnico.
• Si usa controles o ajustes o realiza procedimientos que no sean los especificados aquí, podría
exponerse a radiaciones peligrosas.

PELIGRO

26 ThinkCentre M78 Hardware Maintenance Manual

Algunos productos láser tienen incorporado un diodo láser de clase 3A o clase 3B. Tenga en cuenta lo
siguiente:

Cuando se abre, queda expuesto a radiación láser. No mire directamente al rayo láser, ni siquiera con
instrumentos ópticos, y evite exponerse directamente al rayo láser.

≥18 kg ≥32 kg ≥55 kg

PRECAUCIÓN:

Adopte procedimientos seguros al levantar el equipo.

PRECAUCIÓN:

El botón de control de alimentación del dispositivo y el interruptor de alimentación de la fuente de

alimentación no desconectan la corriente eléctrica suministrada al dispositivo. Además, el dispositivo
podría tener más de un cable de alimentación. Para suprimir toda la corriente eléctrica del dispositivo,
asegúrese de que todos los cables de alimentación estén desconectados de la toma de corriente.

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Chapter 2. Safety information 27

28 ThinkCentre M78 Hardware Maintenance Manual
Chapter 3. General information
This chapter provides general information that applies to all machine types supported by this manual.

Specifications
This section lists the physical specifications for your computer.

For machine types: 1562, 1565, 1662, 1663, 1765, 1766, 2011, 2110, 2111,
2112, 10BN, 10BQ, and 10BR
This section lists the physical specifications for your computer.

Dimensions
Width: 175 mm (6.89 inches)
Height: 414 mm (16.30 inches)
Depth: 442 mm (17.40 inches)
Weight
Maximum configuration as shipped: 11 kg (24.25 lb)
Environment
• Air temperature:
Operating: 10°C to 35°C (50°F to 95°F)
Storage: -40°C to 60°C (-40°F to 140°F) in original shipping package
Storage: -10°C to 60°C (14°F to 140°F) without package
• Humidity:
Operating: 20% to 80% (non-condensing)
Storage: 20% to 90% (non-condensing)
• Altitude:
Operating: -50 to 10 000 ft (-15.2 to 3 048 m)
Storage: -50 to 35 000 ft (-15.2 to 10 668 m)
Electrical input
• Input voltage:
– Low range:
Minimum: 100 V ac
Maximum: 127 V ac
Input frequency range: 50 to 60 Hz
– High range:
Minimum: 200 V ac
Maximum: 240 V ac
Input frequency range: 50 to 60 Hz

© Copyright Lenovo 2012, 2014 29

For machine types: 2113, 2114, 2115, 3515, 4860, 4863, 4865, 4866, 4869,
5100, 10BS, 10BT, and 10BU
This section lists the physical specifications for your computer.

Dimensions
Width: 339.3 mm (13.36 inches)
Height: 99.7 mm (3.93 inches)
Depth: 385.4 mm (15.17 inches)
Weight
Maximum configuration as shipped: 7.5 kg (16.53 lb)
Environment
• Air temperature:
Operating: 10°C to 35°C (50°F to 95°F)
Storage: -40°C to 60°C (-40°F to 140°F) in original shipping package
Storage: -10°C to 60°C (14°F to 140°F) without package
• Humidity:
Operating: 20% to 80% (non-condensing)
Storage: 20% to 90% (non-condensing)
• Altitude:
Operating: -50 to 10 000 ft (-15.2 to 3 048 m)
Storage: -50 to 35 000 ft (-15.2 to 10 668 m)
Electrical input
• Input voltage:
– Low range:
Minimum: 100 V ac
Maximum: 127 V ac
Input frequency range: 50 to 60 Hz
– High range:
Minimum: 200 V ac
Maximum: 240 V ac
Input frequency range: 50 to 60 Hz

Lenovo programs
Your computer comes with Lenovo programs to help you work more easily and securely. Depending on the
Windows® operating system preinstalled, the programs might vary.

Accessing Lenovo programs on the Windows 7 operating system

You can access Lenovo programs on the Microsoft Windows 7 operating system through Windows Search
or from Control Panel. The icon name displayed in the search result or Control Panel might be different from
the program name. You can find the program by its program name or icon name as shown in the Lenovo
programs available on the Windows 7 operating system table.

30 ThinkCentre M78 Hardware Maintenance Manual

Note: If you do not find the program you need, open the Lenovo ThinkVantage® Tools program to find the
dimmed icon for the program. Then double-click the icon to install the program.

To access Lenovo programs through Windows Search, do the following:

1. Click the Start button and then type the program name or the icon name into the search box.
2. Locate the program by the program name or the icon name and then click the program to launch it.

To access Lenovo programs from Control Panel, do the following:

Note: Some Lenovo programs might not be displayed in Control Panel. To find these programs, use
Windows Search.
1. Click Start ➙ Control Panel. Change the view of Control Panel from Category to Large icons or Small
icons.
2. Locate the program by the icon name and then click the program to launch it.

The following table lists the programs available on the Windows 7 operating system.

Note: Depending on your computer model, some of the Lenovo programs might not be available.

Table 1. Lenovo programs available on the Windows 7 operating system

Program name Icon name
Communications Utility Lenovo - Web Conferencing
Fingerprint Manager Pro or Lenovo - Fingerprint Manager Pro or Lenovo - Fingerprint Reader
ThinkVantage Fingerprint Software
Lenovo Bluetooth Lock Lenovo Bluetooth Lock
Lenovo Reach Lenovo Reach
Lenovo SHAREit Lenovo SHAREit
Lenovo Solution Center Lenovo - System Health and Diagnostics
Lenovo ThinkVantage tools Lenovo Thinkvantage tools
Password Manager Lenovo - Password Vault
PC Cloud Manager PC Cloud Manager
Power Manager Lenovo - Power Controls
Recovery Media Lenovo - Factory Recovery Disks or Create Recovery Media
Rescue and Recovery® Lenovo - Enhanced Backup and Restore
System Update Lenovo - Update and Drivers
View Management Utility Lenovo - View Management Utility

Accessing Lenovo programs on the Windows 8 operating system

If your computer is preinstalled with the Microsoft Windows 8 or Microsoft Windows 8.1 operating system,
you can access Lenovo programs by doing one of the following:

• On the Windows 8 operating system, press the Windows key to go to the Start screen. Click a Lenovo
program to launch it. If you cannot find the program you need, move the pointer to the bottom-right corner
of the screen to display the charms. Then click the Search charm to search for the desired program.
• On the Windows 8.1 operating system, press the Windows key to go to the Start screen. Click a
Lenovo program to launch it. If you cannot find the program you need, click the arrow icon in the

Chapter 3. General information 31

 bottom-left corner of the screen to go to the Apps screen. Find the desired program in the apps list or
search for it in the search box in the top-right corner of the screen.

Depending on your computer model, your computer supports some of the following Lenovo programs:
• Fingerprint Manager Pro or ThinkVantage Fingerprint Software
• Lenovo Bluetooth Lock (Windows 8.1 only)
• Lenovo Companion
• Lenovo Reach
• Lenovo SHAREit
• Lenovo Solution Center
• Lenovo Support
• Lenovo Tools
• Password Manager
• PC Cloud Manager (Windows 8.1 only)
• System Update

Lenovo Support Web site

Technical support information is available on the Lenovo Support Web site at:
http://www.lenovo.com/support

This Web site is updated with the latest support information such as the following:
• Drivers and software
• Diagnostic solutions
• Product and service warranty
• Product and parts details
• User guides and manuals
• Knowledge base and frequently asked questions

32 ThinkCentre M78 Hardware Maintenance Manual

Chapter 4. General checkout
Attention
The drives in the computer you are servicing might have been rearranged or the drive startup sequence might
have been changed. Be extremely careful during write operations such as copying, saving, or formatting.
Data or programs can be overwritten if you select an incorrect drive.

General error messages appear if a problem or conflict is found by an application program, the operating
system, or both. For the explanation of these messages, refer to the information supplied with that software
package.

Before replacing a FRU, ensure that the latest level of BIOS is installed on the system. A down-level BIOS
might cause false errors and unnecessary replacement of the system board. For more information on how to
determine and obtain the latest level BIOS, see “BIOS levels” on page 189.

Use the following procedure to help determine the cause of a problem:

1. Power-off the computer and all external devices.
2. Check all cables and power cords.
3. Set all display controls to the middle position.
4. Power-on all external devices.
5. Power-on the computer.
• Look for displayed error codes
• Listen for beep codes
• Look for readable instructions or a main menu on the display.
If you did not receive the correct response, proceed to step 6.
If you do receive the correct response, proceed to step 7.
6. Look at the following conditions and follow the instructions:
• If you hear beep codes during POST, go to “Beep symptoms” on page 61.
• If the computer displays a POST error, go to “POST error codes” on page 62.
• If the computer hangs and no error is displayed, turn off the computer and the power. Then, turn the
power and the computer back on, continue at step 7.
7. Run the Diagnostic programs. See “Diagnostics” on page 53.
• If you receive an error, replace the part that the diagnostic program calls out.
• If the test stops and you cannot continue, replace the last device tested.

Problem determination tips

Due to the variety of hardware and software combinations that can be encountered, use the following
information to assist you in problem determination. If possible, have this information available when
requesting assistance from Service Support and Engineering functions.
• Machine type and model
• Processor or hard disk drive upgrades
• Failure symptom
– Do diagnostics indicate a failure?
– What, when, where, single, or multiple systems?
– Is the failure repeatable?

© Copyright Lenovo 2012, 2014 33

 – Has this configuration ever worked?
– If it has been working, what changes were made prior to it failing?
– Is this the original reported failure?
• Diagnostics version
– Type and version level
• Hardware configuration
– Print (print screen) configuration currently in use
– BIOS level
• Operating system software
– Type and version level

Note: To eliminate confusion, identical systems are considered identical only if they:
1. Are the exact machine type and models
2. Have the same BIOS level
3. Have the same adapters/attachments in the same locations
4. Have the same address jumpers/terminators/cabling
5. Have the same software versions and levels
6. Have the same diagnostic diskettes (version)
7. Have the same configuration options set in the system
8. Have the same setup for operating-system-controlled files

Comparing the configuration and software set-up between “working and non-working” systems will often
lead to problem resolution.

34 ThinkCentre M78 Hardware Maintenance Manual

Chapter 5. Troubleshooting and diagnostics
This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem is
not described here, see “Lenovo Support Web site” on page 32 for additional troubleshooting resources.

Basic troubleshooting
The following table provides information to help you troubleshoot your computer problems.

Note: If you cannot correct the problem, have the computer serviced. For a list of service and support
telephone numbers, refer to the Safety, Warranty, and Setup Guide that comes with your computer or go to
the Lenovo Support Web site at http://www.lenovo.com/support/phone.

Symptom Action
The computer does not start Verify that:
when you press the power
• The power cord is correctly connected to the rear of the computer and to a
switch.
working electrical outlet.
• If your computer has a secondary power switch on the rear of the computer,
make sure that it is switched on.
• The power indicator on the front of the computer is on.
• The computer voltage matches the voltage available at the electrical outlet for
your country or region.
The monitor screen is blank. Verify that:
• The monitor signal cable is correctly connected to the monitor and to the
appropriate monitor connector on the computer.
• The monitor power cord is correctly connected to the monitor and to a working
electrical outlet.
• The monitor is turned on and the brightness and contrast controls are set
correctly.
• The computer voltage matches the voltage available at the electrical outlet for
your country or region.
• If your computer has two monitor connectors, be sure to use the connector
on the graphics card.
The keyboard does not work. Verify that:
• The computer is turned on.
• The keyboard is securely connected to a USB connector on the computer.
• No keys are stuck.
The mouse does not work. Verify that:
• The computer is turned on.
• The mouse is securely connected to a USB connector on the computer.
• The mouse is clean.

© Copyright Lenovo 2012, 2014 35

 Symptom Action
The operating system does not Verify that:
start.
• The startup sequence includes the device where the operating system resides.
Usually, the operating system is on the hard disk drive. For more information,
see “Selecting a startup device” on page 58.
The computer beeps multiple Verify that no keys are stuck.
times before the operating
system starts.

Accessing Control Panel on the Windows 8 operating system

On the Windows operating system, you can view and change computer settings through Control Panel. To
access Control Panel on the Windows 8 operating system, do one of the following:
• From the desktop
1. Move the cursor to the top-right or bottom-right corner of the screen to display the charms.
2. Click Settings.
3. Click Control Panel.
• From the Start screen
1. Move the cursor to the top-right or bottom-right corner of the screen to display the charms.
2. Click Search.
3. On the Apps screen, scroll to the right side, and click Control Panel in the Windows System section.

Troubleshooting procedure
Use the following procedure as a starting point for diagnosing problems you are experiencing with your
computer:
1. Verify that the cables for all attached devices are connected correctly and securely.
2. Verify that all attached devices that require ac power are connected to properly grounded, functioning
electrical outlets.
3. Verify that all attached devices are enabled in the BIOS settings of your computer. For more information
about accessing and changing the BIOS settings, refer to your Chapter 6 “Using the Setup Utility
program” on page 55.
4. Go to the “Troubleshooting” on page 37 and follow the instructions for the type of problem you are
experiencing. If the Troubleshooting information does not help you resolve a problem, continue with the
next step.
5. Try using a previously captured configuration to see if a recent change to hardware or software settings
has caused a problem. Before restoring a previous configuration, capture your current configuration in
case the older configuration settings do not solve the problem or have adverse affects. To restore a
captured configuration, do the following:
• For Windows 7: Click Start ➙ Control Panel ➙ System and Security ➙ System ➙ System
Protection ➙ System Restore.
• For Windows 8: Open Control Panel, and then click System and Security ➙ System ➙ System
Protection ➙ System Restore.
If this does not correct the problem, continue with the next step.
6. Run the diagnostic program. See “Lenovo Solution Center” on page 53 for more information.
• If the diagnostic program detects a hardware failure, contact the Lenovo Customer Support Center.
See “Lenovo Support Web site” on page 32 for more information.

36 ThinkCentre M78 Hardware Maintenance Manual

 • If you are unable to run the diagnostic program, contact the Lenovo Customer Support Center. See
“Lenovo Support Web site” on page 32 for more information.
• If the diagnostic program does not detect a hardware failure, continue with the next step.
7. Use an antivirus program to see if your computer has been infected by a virus. If the program detects a
virus, remove the virus.
8. If none of these actions solve the problem, seek technical assistance. See “Lenovo Support Web
site” on page 32 for more information.

Troubleshooting
Use the troubleshooting information to find solutions to problems that have definite symptoms.

If the symptom your computer is experiencing occurred immediately after you installed a new hardware
option or new software, do the following before referring to the troubleshooting information:
1. Remove the new hardware option or software. If you must remove the computer cover to remove a
hardware option, make sure you review and follow the electrical safety information provided with your
computer. For your safety, do not operate the computer with the cover removed.
2. Run the diagnostic programs to ensure your computer is operating correctly.
3. Reinstall the new hardware option or software following the manufacturer's instructions.

Select the problem your computer is experiencing from the following list:
• “Audio problems” on page 37
• “CD problems” on page 39
• “DVD problems” on page 40
• “Intermittent problems” on page 41
• “Hard disk drive problems” on page 41
• “Keyboard, mouse, or pointing device problems” on page 42
• “Monitor problems” on page 44
• “Networking problems” on page 45
• “Option problems” on page 48
• “Performance and lockup problems” on page 49
• “Printer problems” on page 50
• “Serial port problems” on page 51
• “Software problems” on page 51
• “USB problems” on page 52

Audio problems
Select your symptom from the following list:
• “No audio in Windows” on page 38
• “An audio disc or AutoPlay-enabled disc does not automatically play when it is inserted into a drive”
on page 38
• “Sound comes from one external speaker only” on page 38
• “No audio in DOS applications or games” on page 38

Chapter 5. Troubleshooting and diagnostics 37

No audio in Windows
Symptom: No audio in Windows

Actions:
• If you are using powered external speakers that have an On/Off control, verify that the On/Off control is
set to the On position and the speaker power cable is connected to a properly grounded, functional ac
electrical outlet.
• If your external speakers have a volume control, verify that the volume control is not set too low.
• Double-click the speaker icon in the Windows notification area. A master volume-control window opens.
Verify that the Mute settings are not checked and none of the volume settings is set too low.
• Verify that your external speakers (and headphones, if used) are connected to the correct audio connector
on the computer. Most speaker cables are color-coded to match the connector.

Note: When external-speaker or headphone cables are attached to the audio connector, the internal
speaker, if present, is disabled. In most cases, if an audio adapter is installed in one of the expansion slots,
the audio function built into the system board is disabled; use the audio jacks on the adapter.
• Make sure that the program you are running is designed for use in the Microsoft® Windows operating
system. If the program is designed to run in DOS, the program does not use the Windows sound feature
and must be configured to use SoundBlaster Pro or SoundBlaster emulation.
• Verify that the audio device drivers are correctly installed. See Microsoft Windows help system for
more information.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

An audio disc or AutoPlay-enabled disc does not automatically play when it is

inserted into a drive
Symptom: An audio disc or AutoPlay-enabled disc does not automatically play when it is inserted into a drive

Action: See “CD problems” on page 39.

Sound comes from one external speaker only

Symptom: Sound comes from one external speaker only.

Actions:
• Ensure that the speaker cable is inserted completely into the connector on the computer.
• Make sure the cable that attaches the left speaker to the right speaker is securely connected.
• Double-click the speaker icon in the Windows notification area. A master volume-control window opens.
Verify that the Balance settings are set correctly.

If these actions do not correct the problem, you might have a failing speaker. Have the speaker serviced. If
you need technical assistance, see “Lenovo Support Web site” on page 32.

No audio in DOS applications or games

Symptom: No audio in DOS applications or games

Actions:
• Make sure the DOS application or game is configured to use SoundBlaster Pro or SoundBlaster
emulation. Refer to the documentation that comes with the application or game for instructions on
setting sound-card settings.

38 ThinkCentre M78 Hardware Maintenance Manual

• If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

CD problems
Select your symptom from the following list:
• “An audio disc or AutoPlay-enabled disc does not automatically play when it is inserted into a CD
drive” on page 39
• “A CD or DVD does not work” on page 39
• “Unable to use a startable (bootable) recovery medium, such as the Product Recovery CD, to start
your computer” on page 39

An audio disc or AutoPlay-enabled disc does not automatically play when it is

inserted into a CD drive
Symptom: An audio disc or AutoPlay-enabled disc does not automatically play when it is inserted into
a CD drive.

Actions:
• If you have multiple CD or DVD drives installed (or a combination of CD and DVD drives), try inserting the
disc into the other drive. In some cases, only one of the drives is connected to the audio subsystem.
• If you are using the Windows 7 operating system, follow the action for “A CD or DVD does not work”
on page 39.

If this does not correct the problem, follow the action for “A CD or DVD does not work” on page 39.

A CD or DVD does not work

Symptom: A CD or DVD does not work.

Actions:
• Verify that the disc is inserted correctly, with its label up.
• Make sure that the disc you are using is clean. To remove dust or fingerprints, wipe the disc clean with a
soft cloth from the center to the outside. Wiping a disc in a circular motion might cause loss of data.
• Verify that the disc you are using is not scratched or damaged. Try inserting another disc that you know
is good. If you cannot read from a known-good disc, you might have a problem with your CD or DVD
drive or the cabling to your CD or DVD drive. Make sure that the power cable and signal cable are
securely connected to the drive.

Unable to use a startable (bootable) recovery medium, such as the Product Recovery
CD, to start your computer
Symptom: Unable to use a startable (bootable) recovery medium, such as the Product Recovery CD,
to start your computer.

Action: Make sure that the CD or DVD drive is in the startup sequence before the hard disk drive. Refer
to your “Selecting or changing the startup device sequence” on page 58 for information on viewing and
changing the startup sequence. Note that on some models the startup sequence is permanently set and
cannot be changed.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

Chapter 5. Troubleshooting and diagnostics 39

DVD problems
Select your symptom from the following list:
• “Black screen instead of DVD video” on page 40
• “DVD movie will not play” on page 40
• “No audio or intermittent audio while playing DVD movie” on page 40
• “Playback is very slow or choppy” on page 40
• “Invalid disc or no disc found message” on page 41

Black screen instead of DVD video

Symptom: Black screen instead of DVD video

Actions:
• Restart the DVD player program.
• Close any open files, turn off the computer, and then restart the computer.
• Try a lower screen resolution or color depth.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

DVD movie will not play

Symptom: DVD movie will not play.

Actions:
• Make sure that the disc surface is clean and not scratched.
• Check the disc or package for regional coding. You might need to purchase a disc with coding for
the region where you are using your computer.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

No audio or intermittent audio while playing DVD movie

Symptom: No audio or intermittent audio while playing DVD movie.

Actions:
• Check the volume control settings on your computer and on your speakers.
• Make sure that the disc surface is clean and not scratched.
• Check all cable connections to and from the speakers.
• Use the DVD menu for the video to select a different audio track.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

Playback is very slow or choppy

Symptom: Playback is very slow or choppy.

Actions:
• Disable any background programs, such as AntiVirus or Desktop Themes.

40 ThinkCentre M78 Hardware Maintenance Manual

• Ensure that video resolution is set to less than 1152 x 864.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

Invalid disc or no disc found message

Symptom: Invalid disc or no disc found message

Actions:
• Ensure that a DVD disc is in the drive with the shiny side of the disc facing down.
• Ensure that video resolution is set to less than 1152 x 864.
• On computers that have a CD-ROM or CD-RW drive in addition to a DVD-ROM drive, make sure that the
DVD disc is in the drive labeled “DVD”.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

Intermittent problems
Symptom: A problem occurs only occasionally and is difficult to repeat.

Actions:
• Verify that all cables and cords are securely connected to the computer and attached devices.
• Verify that when the computer is on, the fan grill is not blocked (there is air flow around the grill), and the
fans are working. If airflow is blocked or the fans are not working, the computer might overheat.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

Hard disk drive problems

Select your symptom from the following list:
• “Some or all hard disk drives missing from the Setup Utility program” on page 41
• “"No Operating System Found" message or the system not starting from the correct hard disk drive”
on page 42

Some or all hard disk drives missing from the Setup Utility program
Symptom: Some or all hard disk drives missing from the Setup Utility program

Actions:
• Ensure that all hard disk drive signal cables and power cables are connected correctly.
• Ensure that your computer is configured correctly to support the hard disk drives.
– If your computer is installed with five SATA hard disk drives, ensure that the SATA hard disk drive
enablement module (one to five hard disk drives) is installed.
– If your computer is installed with SAS hard disk drives, ensure that the SAS hard disk drive enablement
module (one to five hard disk drives) or the LSI MegaRAID SAS adapter is installed.

If these actions do not correct the problem, run the diagnostic program Lenovo Solution Center. See “Lenovo
Solution Center” on page 53. If you need technical assistance, see “Lenovo Support Web site” on page 32.

Chapter 5. Troubleshooting and diagnostics 41

"No Operating System Found" message or the system not starting from the correct
hard disk drive
Symptom: "No Operating System Found" message or the system not starting from the correct hard disk drive

Actions:
• Ensure that all hard disk drive signal cables and power cables are connected correctly.
• Ensure that the hard disk drive your computer starts from is listed as the first startup device in the Setup
Utility program. Refer to “Selecting a startup device” on page 58.

Note: In rare cases, the hard disk drive with the operating system might get corrupted or damaged. In such
cases, you might need to replace the hard disk drive.

If these actions do not correct the problem, run the diagnostic program Lenovo Solution Center. See “Lenovo
Solution Center” on page 53. If you need technical assistance, see “Lenovo Support Web site” on page 32.

Keyboard, mouse, or pointing device problems

Select your symptom from the following list:
• “All or some keys on the keyboard do not work” on page 42
• “The mouse or pointing device does not work” on page 43
• “The pointer on the screen does not move smoothly with the mouse” on page 43
• “The wireless keyboard does not work” on page 43

All or some keys on the keyboard do not work

Symptom: All or some keys on the keyboard do not work.

Actions:
• Verify that the keyboard cable is securely connected to the correct connector on the computer.
• If you are using an Enhanced Performance USB keyboard and one or more of the Rapid Access buttons
are the only keys that are not working, these buttons might have been disabled or have not been assigned
to a function. Use the help system in the Enhanced Performance Customization Keyboard program to
help diagnose problems with the Rapid Access buttons.
To open the Enhanced Performance Customization Keyboard program, do one of the following:
– On the Windows 7 operating system, do the following:
1. Click Start ➙ Control Panel.
2. Click Hardware and Sound.
3. Click Devices and Printers.
4. Double-click USB Enhanced Performance Keyboard. The USB Enhanced Performance
Keyboard Customization program starts.
– On the Windows 8 operating system, do the following:
1. Open Control Panel.
2. Click Hardware and Sound.
3. Click Devices and Printers.
4. Double-click USB Enhanced Performance Keyboard. The USB Enhanced Performance
Keyboard Customization program starts.

42 ThinkCentre M78 Hardware Maintenance Manual

If these actions do not correct the problem, have the computer and keyboard serviced. See “Lenovo
Support Web site” on page 32 for details.

The mouse or pointing device does not work

Symptom: The mouse or pointing device does not work.

Actions:
• Verify that the mouse or pointing-device cable is securely attached to the correct connector on the
computer. Depending on the type of mouse you have, the mouse cable will connect to either the
mouse, serial, or USB connector. Some keyboards have integrated USB connectors that can be used
for a USB mouse or pointing device.
• Verify that the device drivers for the mouse or pointing device are installed correctly.
• If you are using a USB keyboard or mouse, verify that the USB connectors are enabled in the BIOS
settings. See “Enabling or disabling a device” on page 57.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

The pointer on the screen does not move smoothly with the mouse
Symptom: The pointer on the screen does not move smoothly with the mouse.

Action: Erratic movement of the mouse pointer is generally caused by a buildup of dirt, oils, and other
contaminants on the ball inside the mouse. Clean the mouse.

The fingerprint reader does not work

Symptom: The fingerprint reader does not work.

Action: The following could cause the fingerprint reader not to operate properly:
• Not enrolling your fingerprint correctly.
• Scratching the surface of the reader with a hard, pointed object.
• Scraping the surface of the reader with your nail or anything hard.
• Using or touching the reader with a dirty finger.
• The surface of your finger is very different from when you enrolled your fingerprint.

The wireless keyboard does not work

Symptom: The wireless keyboard does not work.

Action: If the Transceiver Communications LED is on and the wireless Keyboard does not work, restart your
computer. If restarting your computer does not solve the problem, verify that the following conditions are met:
• The batteries are properly installed.
• The batteries still retain their current.
• The wireless Keyboard is located less than ten meters away from the transceiver.
• The transceiver is fully installed.

Action: If the Transceiver Communications LED is not on, reconnect the transceiver and the keyboard.

Chapter 5. Troubleshooting and diagnostics 43

Monitor problems
Note: Many monitors have status-indicator lights and built-in controls for adjusting brightness, contrast,
width, height, and other picture adjustments. However, the controls vary from monitor type to monitor type.
For information about the status lights and using the controls, refer to the documentation that comes
with your monitor.

Select your symptom from the following list:

• “Wrong characters appear on the screen” on page 44
• “The monitor works when you turn on the computer, but goes blank after some period of computer
inactivity” on page 44
• “The monitor works when you turn on the computer, but goes blank when you start some application
programs” on page 44
• “The image appears to be flickering” on page 44
• “The image is discolored” on page 45

Wrong characters appear on the screen

Symptom: Wrong characters appear on the screen.

Action: Have the computer serviced. For details, see “Lenovo Support Web site” on page 32.

The monitor works when you turn on the computer, but goes blank after some period
of computer inactivity
Symptom: The monitor works when you turn on the computer, but goes blank after some period of computer
inactivity.

Action: The computer is probably set for energy savings with the power-management feature. If the
power-management feature is enabled, disabling it or changing the settings might solve the problem.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

The monitor works when you turn on the computer, but goes blank when you start
some application programs
Symptom: The monitor works when you turn on the computer, but goes blank when you start some
application programs.

Actions:
• Make sure the monitor signal cable is securely connected to the monitor and the monitor connector on
the computer. A loose cable can cause intermittent problems.
• Verify that the necessary device drivers for the application programs are installed. Refer to the
documentation for the affected application program to see if device drivers are required.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

The image appears to be flickering

Symptom: The image appears to be flickering.

Actions:

44 ThinkCentre M78 Hardware Maintenance Manual

• The monitor might be operating in a low-refresh rate display mode. Set the monitor to the highest,
noninterlaced refresh rate supported by your monitor and the video controller in your computer.

Attention: Using a resolution or refresh rate that is not supported by your monitor might damage it.
Check the documentation that comes with your monitor to verify the supported refresh rates.
• The monitor might be affected by interference from nearby equipment. Magnetic fields around other
devices, such as transformers, appliances, fluorescent lights, and other monitors might be causing the
problem. Move fluorescent desk lighting or any equipment that produces magnetic fields farther away
from the monitor. If this does not correct the problem, do the following:
1. Turn off the monitor. (Moving a color monitor while it is turned on might cause screen discoloration.)
2. Adjust the placement of the monitor and other devices so that they are at least 305 mm (12 inches)
apart.
3. Turn on the monitor.
• You can reset the refresh rate through your operating system Control Panel:
On the Windows 7 operating system, click Start ➙ Control Panel ➙ Hardware and Sound ➙ Adjust
screen resolution ➙ Advanced Settings. Then click the Monitor tab and select a new refresh rate.
On the Windows 8 operating system, open Control Panel and click Hardware and Sound ➙ Adjust
screen resolution ➙ Advanced Settings. Then click the Monitor tab and select a new refresh rate.
• See your operating system documentation or help for further information on monitor settings.

If these actions do not correct the problem, your monitor might need service. See “Lenovo Support Web
site” on page 32 for details.

The image is discolored

Symptom: The image is discolored.

Action: The monitor might be affected by interference from nearby equipment. Magnetic fields around other
devices, such as transformers, appliances, fluorescent lights, and other monitors might be causing the
problem. Move fluorescent desk lighting or any equipment that produces magnetic fields further away from
the monitor. If this does not correct the problem, do the following:
1. Turn off the monitor. (Moving a color monitor while it is turned on might cause screen discoloration.)
2. Adjust the placement of the monitor and other devices so that they are at least 305 mm (12 inches) apart.
3. Turn on the monitor.

If these actions do not correct the problem, your monitor might need service. See “Lenovo Support Web
site” on page 32 for details.

Networking problems
The following are the most common networking problems. Select your networking problem from the
following list:
• “Ethernet problems” on page 45

For more information, see “Lenovo Support Web site” on page 32.

Ethernet problems
For Ethernet problems, select your symptom from the following list:
• “Your computer cannot connect to the network” on page 46
• “The adapter stops working for no apparent reason” on page 46

Chapter 5. Troubleshooting and diagnostics 45

• “If your computer is a Gigabit Ethernet model and you use a speed of 1000 Mbps, the connection fails
or errors occur” on page 47
• “If your computer is a Gigabit Ethernet model, it cannot connect to the network at 1000 Mbps. Instead,
it connects at 100 Mbps” on page 47

Your computer cannot connect to the network

Symptom: Your computer cannot connect to the network.

Actions: Ensure that:

• The cable is installed properly.
The network cable must be securely connected to both the Ethernet connector of your computer and
the RJ45 connector of the hub. The maximum allowable distance from the computer to hub is 100
meters. If the cable is connected and the distance is within acceptable limits but the problem persists, try
a different cable.
• The cable is installed properly.
• You are using the correct device driver.
On the Windows 7 operating system, do the following:
1. Click Start ➙ Control Panel.
2. Click Hardware and Sound.
3. Click Device Manager. If you are prompted for an administrator password or confirmation, type the
password or provide confirmation.
4. If an exclamation mark is displayed next to an adapter name under Network adapters, you might
not be using the correct driver or the driver is not enabled. To update the driver, right-click the
highlighted adapter.
5. Click Update Driver Software, and then follow the instructions on the screen.
On the Windows 8 operating system, do the following:
1. Open Control Panel.
2. Click Hardware and Sound.
3. Click Device Manager. If you are prompted for an administrator password or confirmation, type the
password or provide confirmation.
4. If an exclamation mark is displayed next to an adapter name under Network adapters, you might
not be using the correct driver or the driver is not enabled. To update the driver, right-click the
highlighted adapter.
5. Click Update Driver Software, and then follow the instructions on the screen.
• The switch port and the adapter have the same duplex setting.
If you configured the adapter for full duplex, ensure that the switch port is also configured for full duplex.
Setting the wrong duplex mode can degrade performance, cause data loss, or result in lost connections.
• You have installed all networking software that is necessary for your network environment.
Check with your LAN administrator for the necessary networking software.

The adapter stops working for no apparent reason

Symptom: The adapter stops working for no apparent reason.

Action: The network driver files may be corrupt or missing. Update the driver by referring to the “Solution”
description for the procedure to make sure that the correct device driver is installed.

46 ThinkCentre M78 Hardware Maintenance Manual

The Wake on LAN feature is not working
Symptom: The Wake on LAN (WOL) feature is not working.

Actions:
• Make sure that WOL is enabled in the BIOS Setup Utility program.
• If it is, check with your LAN administrator for the necessary settings.

If your computer is a Gigabit Ethernet model and you use a speed of 1000 Mbps, the connection
fails or errors occur
Symptom: If your computer is a Gigabit Ethernet model and you use a speed of 1000 Mbps, the connection
fails or errors occur.

Actions:
• Use Category 5 wiring and make sure that the network cable is securely connected.
• Connect to a 1000 BASE-T hub/switch (not 1000 BASE-X).

If your computer is a Gigabit Ethernet model, it cannot connect to the network at 1000 Mbps. Instead,
it connects at 100 Mbps
Symptom: If your computer is a Gigabit Ethernet model, it cannot connect to the network at 1000 Mbps.
Instead, it connects at 100 Mbps.

Actions:
• Try another cable.
• Make sure that the link partner is set to auto-negotiate.
• Make sure that the switch is 802.3ab-compliant (gigabit over copper).

A wireless LAN problem

Symptom: You cannot connect using the built-in wireless networking card.

Actions:
• Make sure that your wireless LAN driver is the latest version. Check the Web site and verify the driver
version supported by Access Connections is the latest documented in the readme file.
• Make sure that your computer is within range of a wireless access point.
• Make sure that the wireless radio is enabled by double-clicking the Access Connections icon in the
Windows notification area.

Note: On the Windows 7 operating system, click Show hidden icons in the Windows notification
area. The Access Connections icon is displayed. For more information about the icon, see the Help in
Access Connections.
• Check Network Name (SSID), and your encryption information. Use Access Connections to verify this
case-sensitive information.

A wireless WAN problem

Message: Unauthorized WAN card is plugged in - Power off and remove the WAN card.

Action: The wide-area-network card (WAN card) is not supported on this computer. Remove it.

Note: Some computer models do not have a wireless WAN.

Chapter 5. Troubleshooting and diagnostics 47

Bluetooth problem
Symptom: Sound does not come from the Bluetooth headset/headphone but comes from the local speaker
even though the headset/headphone is connected using Headset profile or AV profile.

Action: Do the following:

1. Exit the application that uses the sound device (for example, Windows Media® Player).
2. Open Control Panel.
3. Click Hardware and Sound ➙ Sound.
4. Select the Playback tab.
5. If you are using the Headset profile, select Bluetooth Hands-free Audio and click the Set Default
button. If you are using the AV profile, select Stereo Audio and click the Set Default button.
6. Click OK to close the Sound window.

Note: Bluetooth is supported only on some computer models.

Option problems
Use this information to diagnose problems with Lenovo hardware options that do not have their own
troubleshooting information.

Select your symptom from the following list:

• “An option that was just installed does not work” on page 48
• “An option that previously worked does not work now” on page 48

An option that was just installed does not work

Symptom: An option that was just installed does not work.

Action: Verify that:

• The option is designed for your computer.
• You followed the installation instructions supplied with the option and the installation instructions provided
with your computer, and all option files (such as device drivers, if required) are installed correctly.
• You have not loosened other installed options or cables.
• If the option is an adapter, you have provided enough hardware resources for the adapter to function
correctly. See the documentation supplied with the adapter (as well as the documentation for any other
installed adapters) to determine the resources required for each adapter.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

An option that previously worked does not work now

Symptom: An option that previously worked does not work now.

Actions:
• Verify that all option hardware and cable connections are secure.
• If the option comes with its own test instructions, use those instructions to test the option.
• If the failing option is a SCSI option, verify that:
– The cables for all external SCSI options are connected correctly.
– The last option in each SCSI chain, or the end of the SCSI cable, is terminated correctly.

48 ThinkCentre M78 Hardware Maintenance Manual

 – All external SCSI options are turned on. External SCSI options must be turned on before the computer
is turned on. For more information, see your SCSI documentation.
• Verify that the option and any required device drivers are installed correctly.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

Performance and lockup problems

Poor performance and lockup problems can be a result of any of the following:
• “Insufficient free hard disk drive space” on page 49
• “Excessive number of fragmented files” on page 50
• “Insufficient memory” on page 50

Make a selection from the above list to find out more about the corrective actions you can take.

Insufficient free hard disk drive space

Symptom: Insufficient free hard disk drive space

The Windows operating system will slow down and might produce errors if the hard disk drive gets too full.

To check the amount of free space on the Windows 7 operating system, do the following:
1. Click Start ➙ Computer.
2. Right-click your C drive entry and then click Properties. The amount of free disk space is displayed.

To check the amount of free space on the Windows 8 operating system, do the following:
1. Open the Windows Explorer and click Computer.
2. Right-click your C drive entry and then click Properties. The amount of free disk space is displayed.

To free up disk space, do any of the following:

• Procedure 1
1. On the Windows 7 operating system, click Start ➙ Computer. On the Windows 8 operating system,
open the Windows Explorer and click Computer.
2. Right-click your C drive entry and then click Properties.
3. Click Disk Cleanup.
4. A list of unnecessary file categories is displayed. Select each file category you want to delete,
and then click OK.
• Procedure 2
1. Open Control Panel.
2. Click Programs.
3. Click Turn Windows features on or off.
4. A list of optional Windows components is displayed. Follow the instructions on the screen.
• Procedure 3
1. On the Windows 7 operating system, click Start ➙ Computer. On the Windows 8 operating system,
open the Windows Explorer and click Computer.
2. Right-click your C drive entry and then click Properties.
3. Click Disk Cleanup.

Chapter 5. Troubleshooting and diagnostics 49

 4. Click Clean up system files.
5. Click the More Options tab.
6. In the Programs and Features area, click the Clean up button.
7. A list of installed programs is displayed. Select the program that you want to remove. Click
Uninstall/Change.
• Clean out your Inbox, Sent Items, and Deleted Items folders from your e-mail application. The folder
names and procedures vary depending on your e-mail application. If you need assistance, see the
help system for your e-mail application.

Excessive number of fragmented files

Symptom: Excessive number of fragmented files

Action: Run the Windows Disk Defragmenter program.

Note: Depending on the size of the hard disk drive and amount of data currently stored on the hard disk
drive, the disk-defragmentation process might take up to several hours to complete.

On the Windows 7 operating system, do the following:

1. Close any programs that are currently running and close any open windows.
2. Click Start ➙ Computer.
3. Right-click your C drive entry and then click Properties.
4. Click the Tools tab.
5. Click Defragment Now, then click Continue.
6. Click Defragment Now again to start a disk-defragmentation process.

On the Windows 8 operating system, do the following:

1. Close any programs that are currently running and close any open windows.
2. Open the Windows Explorer and click Computer.
3. Right-click your C drive entry and then click Properties.
4. Click the Tools tab.
5. Click Optimize.
6. Click Optimize again to start a disk-defragmentation process.

Insufficient memory
Symptom: Insufficient memory

In general, the more memory that is installed, the better the Windows operating system runs.

Action: Install additional memory. For information about purchasing memory, see “Lenovo Support Web
site” on page 32. For step-by-step instructions on installing memory, see “Installing or replacing a memory
module” on page 85.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

Printer problems
Symptom: The printer does not work.

50 ThinkCentre M78 Hardware Maintenance Manual

Actions: Verify that:
1. The printer is turned on and is online.
2. Paper is loaded correctly.
3. The printer signal cable is securely connected to the correct parallel, serial, or USB connector on the
computer.

Note: Non-IEEE-approved printer signal cables might cause unpredictable problems.

1. Any device drivers and other software that came with the printer are correctly installed.
2. You have assigned the printer port correctly in your operating system, application program, or BIOS
settings. For more information about BIOS settings, see Chapter 6 “Using the Setup Utility program”
on page 55.

If the problem persists, run the tests described in the documentation that comes with your printer. If you
cannot correct the problem, have the computer serviced. See “Lenovo Support Web site” on page 32.

Serial port problems

Use this information to troubleshoot the serial port and devices attached to the serial port.

Symptom: Serial port cannot be accessed.

Actions:
• Make sure the serial cable is securely connected to the serial port on the computer and to the serial
device. If the serial device has its own power cord, make sure it is attached to a properly grounded
electrical outlet.
• If the serial device has its own On/Off switch, make sure it is in the On position.
• If the serial device has an Online switch, make sure it is in the Online position.
• If the serial device is a printer, make sure paper is loaded correctly.
• Verify that any software supplied with the serial device is correctly installed. Refer to the documentation
for the serial-device option.
• Make sure that the serial-port adapter, if you added one, is properly installed and firmly seated.

If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on
page 53 for instructions). If you need technical assistance, see “Lenovo Support Web site” on page 32.

Software problems
Select your symptom from the following list:
• “When using a sort feature, dates do not sort in the correct order” on page 51
• “Software does not work as expected” on page 51

When using a sort feature, dates do not sort in the correct order
Symptom: When using a sort feature, dates do not sort in the correct order.

Action: Some software developed before the year 2000 used only the last two digits of a year to sort
dates, always assuming the first two digits were 19. Consequently, these programs sort dates out of order.
Check with your software manufacturer to see if any updates are available. Many software manufacturers
make updates available from the World Wide Web.

Software does not work as expected

Symptom: Software does not work as expected.

Chapter 5. Troubleshooting and diagnostics 51

Actions:
• Most software programs have built-in help systems that provide instructions for most tasks. If you are
having difficulty performing a specific task within a software program, refer to the help system for that
program. Help systems are typically accessible from a menu or button in the program, and frequently
from the F1 key.
• If you are having difficulty with the Windows operating system or one of its components, refer to the
Windows help system. It is accessible from the Windows Start menu.
• To determine if problems are caused by newly installed software, verify that:
– Your computer has the minimum memory requirements needed to use the software. See the
information supplied with the software to verify memory requirements. (If you just installed an adapter
or memory, you might have a memory-address conflict.)
– The software is designed to operate on your computer.
– Other software works on your computer.
– The software you are using works correctly on another computer.
• If you received any error messages while using the software program, see the printed documentation
supplied with the software or the help system for that software for a description of the messages and
solutions to the problem.
• Check with your software manufacturer to see if any updates are available. Many software manufacturers
make updates available from the World Wide Web.
• If the software program used to work correctly, but does not work correctly now, do the following:
– On the Windows 7 operating system, click Start ➙ Control Panel ➙ System and Security ➙ System
➙ System Protection ➙ System Restore. Then, follow the instructions on the screen.
– On the Windows 8 operating system, open Control Panel and click System and Security ➙ System ➙
System Protection ➙ System Restore. Then, follow the instructions on the screen.
• If you are unable to resolve the problem through other methods, uninstall the software program and
reinstall it.

If these actions do not correct the problem, you might need technical assistance. Contact your software
manufacturer or see “Lenovo Support Web site” on page 32 for details.

USB problems
Symptom: The USB connectors cannot be accessed.

Actions:
• Make sure the USB cable is securely connected to the USB connector and to the USB device. If the USB
device has its own power cord, make sure it is attached to a properly grounded electrical outlet.
• If the USB device has its own On/Off switch, make sure it is in the On position.
• If the USB device has an Online switch, make sure it is in the Online position.
• If the USB device is a printer, make sure paper is loaded correctly.
• Make sure any device drivers or other software supplied with the USB device is correctly installed.
Refer to the documentation for the USB device.
• Reset the device by detaching and reattaching the USB connector.

If these actions do not correct the problem, run the diagnostic programs to test the USB connector (see
“Lenovo Solution Center” on page 53 for instructions). If the USB device came with its own diagnostics,
run those diagnostics against the USB device. If you need technical assistance, see “Lenovo Support
Web site” on page 32.

52 ThinkCentre M78 Hardware Maintenance Manual

Diagnostics
The diagnostic program is used to test hardware components of your computer. The diagnostic program can
also report operating-system-controlled settings that interfere with the correct operation of your computer.
You can use the preinstalled diagnostic program to diagnose computer problems, if your computer is
running the Windows operating system.

Notes:
1. Your computer is preinstalled with the Lenovo Solution Center program for diagnostic purposes. For
more information about the Lenovo Solution Center program, see “Lenovo Solution Center” on page 53.
2. If you are unable to isolate and repair the problem yourself after running the diagnostic program, save
and print the log files created by the diagnostic program. You will need the log files when you speak to a
Lenovo technical support representative.

Lenovo Solution Center

The Lenovo Solution Center program enables you to troubleshoot and resolve computer problems. It
combines diagnostic tests, system information collection, security status, and support information, along
with hints and tips for maximum system performance.

Notes:
• The Lenovo Solution Center program can be downloaded from http://www.lenovo.com/diags.
• If you are using other Windows operating system rather than Windows 7 and Windows 8, go to
http://www.lenovo.com/diags for the latest information on diagnostics for your computer.

To run the Lenovo Solution Center program, see “Lenovo programs” on page 30.

For additional information, refer to the Lenovo Solution Center help system.

Note: If you are unable to isolate and repair the problem yourself after running the program, save and print
the log files. You will need the log files when you speak to a Lenovo technical support representative.

UEFI diagnostic program

A UEFI diagnostic program is preinstalled on the computer. It enables you to test memory modules and
internal storage devices, view system information, and check and recover bad sectors on internal storage
devices.

To run the UEFI diagnostic program, do the following:

1. Turn on the computer. If the computer cannot be turned on, go to “Basic troubleshooting” on page
35. If an error code is displayed, go to Chapter 7 “Symptom-to-FRU index” on page 61 for error code
descriptions and troubleshooting hints.
2. Repeatedly press and release the F10 key when turning on the computer. The main screen of the
UEFI diagnostic program is displayed.
3. Follow the instructions on the screen to use the diagnostic program.

The options on the main screen are as follows:

Chapter 5. Troubleshooting and diagnostics 53

Table 2. Items on the main screen of the UEFI diagnostic program
DIAGNOSTICS TOOLS
• LCD test • System information
• Memory - Quick test • Recover bad sectors tool
• Memory - Extended test • Generate configuration file
• Motherboard test • Execute from configuration file
• PCI-e test • Exit application
• Storage - Quick test

54 ThinkCentre M78 Hardware Maintenance Manual

Chapter 6. Using the Setup Utility program
The Setup Utility program is used to view and change the configuration settings of your computer, regardless
of which operating system you are using. However, the operating system settings might override any similar
settings in the Setup Utility program.

Starting the Setup Utility program

To start the Setup Utility program, do the following:
1. Make sure your computer is turned off.
2. Repeatedly press and release the F1 key when turning on the computer. When you hear multiple
beeps or see a logo screen, release the F1 key.

Note: If a Power-On Password or an Administrator Password has been set, the Setup Utility program
menu will not be displayed until you type the correct password. For more information, see “Using
passwords” on page 55.

When the POST detects that the hard disk drive has been removed from your computer or the memory
module size has decreased, an error message will be displayed when you start the computer and you will be
prompted to do one of the following:
• Press F1 to enter the Setup Utility program.

Note: After you enter the Setup Utility program, select Save Changes and Exit at the bottom of the
screen. The error message will not be displayed again.
• Press F2 to bypass the error message and log in to the operating system.

Note: You have to enable the configuration change detection feature for the POST to detect the removal of
the hard disk drive. To enable the configuration change detection feature, do the following:
1. Start the Setup Utility program.
2. From the Setup Utility program main menu, select Security ➙ Configuration Change Detection,
and press Enter.
3. Select Enabled and press Enter.
4. Press F10 to save changes and exit the Setup Utility program. Press Enter when prompted to confirm
the exit.

Viewing and changing settings

The Setup Utility program menu lists various items about the system configuration. To view or change
settings, start the Setup Utility program. See “Starting the Setup Utility program” on page 55. Then, follow
the instructions on the screen.

You can use either the keyboard or the mouse to navigate through BIOS menu choices. The keys used to
perform various tasks are displayed at the bottom of each screen.

Using passwords
By using the Setup Utility program, you can set passwords to prevent unauthorized access to your computer
and data. The following types of passwords are available:
• Power-On Password

© Copyright Lenovo 2012, 2014 55

• Administrator Password
• Hard Disk Password

You do not have to set any passwords to use your computer. However, using passwords improves
computing security. If you decide to set any passwords, read the following sections.

Password considerations
A password can be any combination of up to 64 alphabetic and numeric characters. For security reasons, it
is recommended to use a strong password that cannot be easily compromised. To set a strong password,
use the following guidelines:
• Have at least eight characters in length
• Contain at least one alphabetic character and one numeric character
• Setup Utility program and hard disk drive passwords are not case sensitive
• Not be your name or your user name
• Not be a common word or a common name
• Be significantly different from your previous passwords

Power-On Password
When a Power-On Password is set, you are prompted to type a valid password each time the computer is
turned on. The computer cannot be used until the valid password is typed in.

Administrator Password
Setting an Administrator Password deters unauthorized users from changing configuration settings. If you
are responsible for maintaining the configuration settings of several computers, you might want to set an
Administrator Password.

When an Administrator Password is set, you are prompted to type a valid password each time you try to
access the Setup Utility program. The Setup Utility program cannot be accessed until a valid password
is typed in.

If both the Power-On Password and Administrator Password are set, you can type either password. However,
you must use your Administrator Password to change any configuration settings.

Hard Disk Password

Setting a Hard Disk Password prevents unauthorized access to the data on the hard disk drive. When a
Hard Disk Password is set, you are prompted to type a valid password each time you try to access the
hard disk drive.

Notes:
• After you set a Hard Disk Password, your data on the hard disk drive is protected even if the hard disk
drive is removed from one computer and installed in another.
• If the Hard Disk Password is forgotten, there is no way to reset the password or recover data from the
hard disk drive.

Setting, changing, and deleting a password

To set, change, or delete a password, do the following:
1. Start the Setup Utility program. See “Starting the Setup Utility program” on page 55.

56 ThinkCentre M78 Hardware Maintenance Manual

 2. From the Setup Utility program main menu, select Security.
3. Depending on the password type, select Set Power-On Password, Set Administrator Password, or
Hard Disk Password.
4. Follow the instructions on the right side of the screen to set, change, or delete a password.

Note: A password can be any combination of up to 64 alphabetic and numeric characters. For more
information, see “Password considerations” on page 56.

Erasing lost or forgotten passwords (clearing CMOS)

This section provides instructions on how to erase lost or forgotten passwords, such as a user password.

To erase a lost or forgotten password, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover.
3. Locate the Clear CMOS /Recovery jumper on the system board. See “Locating parts on the system
board” on page 71.
4. Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and
pin 3).
5. Reinstall the computer cover and connect the power cord.
6. Turn on the computer and leave it on for approximately 10 seconds. Then, turn off the computer by
holding the power switch for approximately five seconds.
7. Repeat step 1 through step 2.
8. Move the Clear CMOS /Recovery jumper back to the standard position (pin 1 and pin 2).
9. Reinstall the computer cover and connect the power cord.

Enabling or disabling a device

This section provides information on how to enable or disable user access to the following devices:

USB Setup Use this option to enable or disable a USB connector. When a USB connector is
disabled, the device connected to the USB connector cannot be used.
SATA Controller When this feature is set to Disable, all devices connected to the SATA connectors
(such as hard disk drives or the optical drive) are disabled and cannot be accessed.

To enable or disable a device, do the following:

1. Start the Setup Utility program. See “Starting the Setup Utility program” on page 55.
2. From the Setup Utility program main menu, select Devices.
3. Depending on the device you want to enable or disable, do one of the following:
• Select USB Setup to enable or disable a USB device.
• Select ATA Drive Setup to enable or disable a SATA device.
4. Select the desired settings and press Enter.
5. Press F10 to save changes and exit the Setup Utility program. See “Exiting the Setup Utility program”
on page 60.

Chapter 6. Using the Setup Utility program 57

Selecting a startup device
If your computer does not start up from a device such as the disc or hard disk drive as expected, do one of
the following to select the startup device you want.

Selecting a temporary startup device

Use this procedure to select a temporary startup device.

Note: Not all discs and hard disk drives are bootable.
1. Turn off your computer.
2. Repeatedly press and release the F12 key when turning on the computer. When the Please select
boot device window displays, release the F12 key.
3. Select the desired startup device and press Enter. The computer will start up from the device you
selected.

Note: Selecting a startup device from the Please select boot device window does not permanently change
the startup sequence.

Selecting or changing the startup device sequence

To view or permanently change the configured startup device sequence, do the following:
1. Start the Setup Utility program. See “Starting the Setup Utility program” on page 55.
2. From the Setup Utility program main menu, select Startup.
3. Select the devices for the Primary Startup Sequence, the Automatic Startup Sequence, and the Error
Startup Sequence. Read the information displayed on the right side of the screen.
4. Press F10 to save changes and exit the Setup Utility program. See “Exiting the Setup Utility program”
on page 60.

Enabling ErP LPS compliance mode

Lenovo computers meet the eco-design requirements of the ErP Lot 3 regulation. For more information, go
to:
http://www.lenovo.com/ecodeclaration

You can enable the energy-related products directive (ErP) lowest power state (LPS) compliance mode in the
Setup Utility program to reduce the consumption of electricity when your computer is in sleep or off mode.

To enable ErP LPS compliance mode in the Setup Utility program, do the following:
1. Start the Setup Utility program. See “Starting the Setup Utility program” on page 55.
2. From the Setup Utility program main menu, select Power ➙ Enhanced Power Saving Mode, and
press Enter.
3. Select Enabled and press Enter.
4. From the Power menu, select Automatic Power On and press Enter.
5. Select Wake on Lan and press Enter.
6. Select Disabled and press Enter.
7. Press F10 to save changes and exit the Setup Utility program. Press Enter when prompted to confirm
the exit.

Note: When ErP LPS compliance mode is enabled, you can wake up your computer by doing one of
the following:

58 ThinkCentre M78 Hardware Maintenance Manual

• Pressing the power switch
• Enabling the wake up on alarm feature
The wake up on alarm feature enables your computer to wake up at a set time. To enable the wake
up on alarm feature, do the following:
1. Start the Setup Utility program.
2. From the Setup Utility program main menu, select Power ➙ Automatic Power On, and press Enter.
3. Select Wake Up on Alarm and press Enter. Then follow the instructions on the screen.
4. Press F10 to save changes and exit the Setup Utility program. Press Enter when prompted to
confirm the exit.
• Enabling the after power loss feature
The after power loss feature enables your computer to wake up when the power supply resumes after a
sudden loss of electricity. To enable the after power loss feature, do the following:
1. Start the Setup Utility program.
2. From the Setup Utility program main menu, select Power ➙ After Power Loss, and press Enter.
3. Select Power On and press Enter.
4. Press F10 to save changes and exit the Setup Utility program. Press Enter when prompted to
confirm the exit.

ICE performance mode

You can adjust the acoustic and thermal performance of your computer through the ICE Performance
Mode menu. Two choices are available:
• Better Acoustic Performance (default setting)
• Better Thermal Performance

By enabling Better Acoustic Performance, your computer will run with less noise at a normal thermal
level. By enabling Better Thermal Performance, your computer will run at a better thermal level with
normal acoustic performance.

To configure the ICE performance mode, do the following:

1. Start the Setup Utility program. See “Starting the Setup Utility program” on page 55.
2. From the Setup Utility program main menu, select Power.
3. Select Intelligent Cooling Engine (ICE). The Intelligent Cooling Engine (ICE) window is displayed.
4. Select ICE Performance Mode. The ICE Performance Mode window is displayed.
5. Select Better Acoustic Performance or Better Thermal Performance as desired.
6. Press F10 to save changes and exit the Setup Utility program. See “Exiting the Setup Utility program”
on page 60.

ICE thermal alert

You can monitor the thermal function of your computer under critical thermal situations through the ICE
Thermal Alert menu. Two choices are available:
• Enabled (default setting)
• Disabled

Chapter 6. Using the Setup Utility program 59

After enabling the ICE thermal alert function, when critical thermal situations occur, such as malfunctioning
fans, abnormally high temperature, and poor cooling performances, an alert log will be written into the
Windows system log. The alert log can help you identify the thermal problems.

To configure the ICE thermal alert function, do the following:

1. Start the Setup Utility program. See “Starting the Setup Utility program” on page 55.
2. From the Setup Utility program main menu, select Power.
3. Select Intelligent Cooling Engine (ICE). The Intelligent Cooling Engine (ICE) window is displayed.
4. Select ICE Thermal Alert. The ICE Thermal Alert window is displayed.
5. Select Enabled or Disabled as desired.
6. Press F10 to save changes and exit the Setup Utility program. See “Exiting the Setup Utility program”
on page 60.

Changing the BIOS settings before installing a new operating system

BIOS settings vary by operating system. Change the BIOS settings before installing a new operating system.

To change the BIOS settings, do the following:

1. Start the Setup Utility program. See “Starting the Setup Utility program” on page 55.
2. From the Setup Utility program main menu, select Exit ➙ OS Optimized Default.
3. Depending on the operating system to be installed, do one of the following:
• To install the Windows 8 (64-bit) operating system, select Enabled.
• To install an operating system other than Windows 8 (64-bit), select Disabled.
4. Select Yes in the window displayed and press Enter to confirm your selection.
5. Press F10 to save changes and exit the Setup Utility program. See “Exiting the Setup Utility program”
on page 60.

Exiting the Setup Utility program

After you finish viewing or changing settings, press Esc to return to the Setup Utility program main menu.
You might have to press Esc several times. Do one of the following:
• If you want to save the new settings, press F10 to save changes and exit the Setup Utility program.
• If you do not want to save the settings, select Exit ➙ Discard Changes and Exit, and then press Enter.
When the Reset Without Saving window shows, select Yes, and then press Enter to exit the Setup
Utility program.
• If you want to return to the default settings, press F9 to load the default settings, and then press F10 to
save and exit the Setup Utility program.

60 ThinkCentre M78 Hardware Maintenance Manual

Chapter 7. Symptom-to-FRU index
The Symptom-to-FRU index lists error symptoms and possible causes. The most likely cause is listed first.
Always begin with the Chapter 4 “General checkout” on page 33. You can use this index to help you decide
which FRUs are needed when servicing a computer. If you are unable to correct the problem using this
index, go to “Undetermined problems” on page 65.

Notes:
1. If you have both an error message and an incorrect audio response, diagnose the error message first.
2. If you cannot run the diagnostic tests or you get a diagnostic error message when running a test, but did receive a
POST error message, diagnose the POST error message first.
3. If you did not receive any error message, look for a description of your error symptoms in the first part of this index.

Hard disk drive boot error

A hard disk drive boot error (error codes 1962 and I999030X) can have the following causes.

Error FRU/Action
The start-up drive is not in the boot sequence in Check the configuration and ensure the start-up drive is
configuration. in the boot sequence.
No operating system installed on the boot drive. Install an operating system on the boot drive.
The boot sector on the start-up drive is corrupted. The drive must be formatted. Do the following:
1. Attempt to back up the data on the failing hard disk
drive.
2. Using the operating systems program, format the
hard disk drive.
The drive is defective. Replace the hard disk drive.

Power supply problems

If you suspect a power problem, use the following procedures.

Check/Verify FRU/Action
Check the following for proper installation: Reseat connectors
• Power cord
• On/Off switch connector
• On/Off switch power supply connector
• System board power supply connectors
• Microprocessor(s) connection
Check the power cord for continuity. Power cord
Check the power-on switch for continuity. Power-on switch

Beep symptoms
Beep symptoms are tones or a series of tones separated by pauses (intervals without sound) during POST.

© Copyright Lenovo 2012, 2014 61

The following tables describes beep symptoms.

Beep Symptom FRU/Action

2 short beeps CMOS setting error Perform the following actions in order.
1. Start the Setup Utility program and press F10 to
Save and exit. See Chapter 6 “Using the Setup Utility
program” on page 55.
2. Start the Setup Utility program and press F9 to load
defaults and then press F10 to Save and exit.
3. Perform a Boot-block recovery. See “Recovering
from a POST/BIOS update failure” on page 190.
3 short beeps and then 1 long beep DRAM memory Perform the following actions in order.
error 1. Make sure the memory module(s) are properly seated
in the connector(s).
2. Replace the memory module(s).
3. Replace the system board.

POST error codes

Each time you power-on the system, it performs a series of tests that check the operation of the system
and some options. This series of tests is called the Power-On Self-Test, or POST. POST does the following
operations.
• Checks some basic system-board operations
• Checks the memory operation
• Starts the video operation
• Verifies that the boot drive is working

If the POST detects a problem, an error message appears on the screen. A single problem can cause several
error messages to appear. When you correct the cause of the first error message, the other error messages
probably will not appear on the screen the next time you turn on the system.

POST Error code POST Error message Description/Action

00CE Machine Type or Serial Number is INVALID This error message is displayed when the machine
type or the serial number is invalid.
0211 Keyboard not found This error message is displayed when there is no
keyboard detected.
0135 Fan failure The system might be overheating.

Press F1 to enter the Setup Utility program.

Then press F10 to save and exit the Setup Utility
program.

Note: If the problem is caused by the

microprocessor fan, pressing F10 will not solve
the problem.
0164 Memory size decreased This error message is displayed when the memory
size has decreased.

Press F1 to enter the Setup Utility program.

Then press F10 to save and exit the Setup Utility
program.

62 ThinkCentre M78 Hardware Maintenance Manual

POST Error code POST Error message Description/Action
1762 Configuration change has occurred This error message is displayed when a hard disk
drive or optical drive change has been made.

Press F1 to enter the Setup Utility program.

Then press F10 to save and exit the Setup Utility
program.
1820 More than one external fingerprint reader If more than one external fingerprint reader is
is attached. Power off and remove all but connected to a computer, this error message will
the reader that you set up within your main be displayed to inform you to remove all of the
operating system. fingerprint keyboards except the one compatible
with the fingerprint application on your computer.
1962 No operating system found. Press any key This error occurs only after the POST is completed.
to repeat boot sequence. Press any key to repeat boot sequence.
0162 Setup data integrity check failure Press F1 to enter the Setup Utility program.
Then press F10 to save and exit the Setup Utility
program.
0167 No processor microcode update found This error message indicates that there is
no microcode update image for the current
microprocessor.
0175 System Security - Security data corrupted Press F1 to enter the Setup Utility program.
Then press F10 to save and exit the Setup Utility
program.
0176 System Security - The system has been This error message is displayed when the
tampered with computer is turned on with the cover open or
removed.

Press F1 to enter the Setup Utility program.

Then press F10 to save and exit the Setup Utility
program.
0189 System Security - Can not read the This error message indicates that the Security
Security EEPROM EEPROM may be broken or removed.

Press F1 to enter the Setup Utility program.

Then press F10 to save and exit the Setup Utility
program.
0197 System Security - Unauthorized security Press F1 to enter the Setup Utility program.
data change detected Then press F10 to save and exit the Setup Utility
program.
0190 System Security - Invalid security change Press F1 to enter the Setup Utility program.
requested Then press F10 to save and exit the Setup Utility
program.
0199 System Security - Security password retry Press F1 to enter the Setup Utility program.
count exceeded Then press F10 to save and exit the Setup Utility
program.

Chapter 7. Symptom-to-FRU index 63

Miscellaneous error messages
Message/Symptom FRU/Action
Changing display colors Display/Monitor
Computer will not power-off. See “Hard disk drive boot 1. Power Switch
error” on page 61. 2. System Board
3. Riser card, if installed
Computer will not RPL from server 1. Ensure that network is in startup sequence as first
device or first device after diskette
2. Ensure that network adapter is enabled for RPL
3. Network adapter (Advise network administrator of
new MAC address)
Computer will not perform a Wake on LAN (if applicable) 1. Check power supply and signal cable connections
to network adapter
2. Ensure that the operating system settings are set to
enable Wake on LAN
3. Ensure Wake on LAN feature is enabled in
Setup/Configuration (see “Starting the Setup Utility
program” on page 55)
4. Ensure network administrator is using correct MAC
address
5. Ensure no interrupt or I/O address conflicts
6. Network adapter (advise network administrator of
new MAC address)
Dead computer. See “Hard disk drive boot error” on page 1. Power Supply
61. 2. System Board
Diskette drive in-use light remains on or does not light 1. Diskette Drive
when drive is active. 2. System Board
3. Diskette Drive Cable
Flashing cursor with an otherwise blank display. 1. System Board
2. Primary Hard Disk Drive
3. Hard Disk Drive Cable
Incorrect memory size during POST 1. Run the Memory tests
2. Memory Module
3. System Board
"Insert a Diskette" icon appears with a known-good 1. System Board
diagnostics diskette in the first 3.5-inch diskette drive. 2. Diskette Drive Cable
3. Network Adapter
Intensity or color varies from left to right of characters 1. Display
and color bars 2. Video adapter (if present)
3. System Board
No power or fan not running 1. See “Hard disk drive boot error” on page 61.

64 ThinkCentre M78 Hardware Maintenance Manual

 Message/Symptom FRU/Action
Non-system disk or disk error-type message with a 1. Diskette Drive
known-good diagnostic diskette. 2. System Board
3. Diskette Drive Cable
Other display symptoms not listed above (including blank 1. Display
or illegible display) 2. System Board
Power-on indicator or hard disk drive in-use light not on, 1. Power switch/LED assembly
but computer works correctly 2. System Board
Printer problems 1. Printer
2. System Board
Program loads from the hard disk with a known-good 1. Run Setup and check Startup sequence.
diagnostics diskette in the first 3.5-inch diskette drive 2. Diskette Drive
3. Diskette Drive Cable
4. System Board
5. Power Supply
RPL computer cannot access programs from its own hard 1. If network administrator is using LCCM Hybrid RPL,
disk. check startup sequence:
a. First device - network
b. Second device - hard disk
2. Hard disk drive
RPL computer does not RPL from server 1. Check startup sequence
2. Check the network adapter LED status
Serial or parallel port device failure (system board port) 1. External Device Self-Test OK?
2. External Device
3. Cable
4. System Board
Serial or parallel port device failure (adapter port) 1. External Device Self-Test OK?
2. External Device
3. Cable
4. Alternate Adapter
5. System Board
Some or all keys on the keyboard do not work 1. Keyboard
2. Keyboard Cable
3. System Board

Undetermined problems
If you encounter undetermined problems, do the following:
1. Turn off the computer and the power.
2. Remove or disconnect the following components (if installed) one at a time.
a. External devices (modem, printer, or mouse)
b. Any adapter cards
c. Memory modules

Chapter 7. Symptom-to-FRU index 65

 d. Extended video memory
e. External Cache
f. External Cache RAM
g. Hard disk drive
h. Diskette drive
3. Turn on the power and the computer to re-test the system.
4. Repeat steps 1 through 3 until you find the failing device or adapter cards.

If all devices and adapter cards have been removed, and the problem continues, replace the system board.

66 ThinkCentre M78 Hardware Maintenance Manual

Chapter 8. Locations
This chapter introduces the locations of the computer hardware components.

For machine types: 1562, 1565, 1662, 1663, 1765, 1766, 2011, 2110, 2111,
2112, 10BN, 10BQ, and 10BR

Locating connectors, controls, and indicators on the front of your

computer
Figure 1 “Front connector, control, and indicator locations” on page 67 shows the locations of the
connectors, controls, and indicators on the front of your computer.

Figure 1. Front connector, control, and indicator locations

1 Hard disk drive activity indicator 5 USB 2.0 connector (USB port 1)

2 Power indicator 6 Headphone connector

3 Power switch 7 Microphone connector

4 Optical drive eject/close button 8 USB 2.0 connector (USB port 2)

© Copyright Lenovo 2012, 2014 67

Locating connectors on the rear of your computer
Figure 2 “Rear connector locations” on page 68 shows the locations of the connectors on the rear of your
computer. Some connectors on the rear of your computer are color-coded to help you determine where to
connect the cables on your computer.

Figure 2. Rear connector locations

1 Power cord connector 10 Audio line-out connector

2 Serial port (Serial port 1) 11 Audio line-in connector

3 PS/2 keyboard and mouse connectors 12 PCI Express x16 graphics card slot
(optional)
4 VGA monitor connector 13 PCI Express x1 card slot

5 DisplayPort® connector 1 14 PCI card slots (2)

6 USB 3.0 connectors (USB ports 5 to 8) 15 Cable lock slots (2)

7 USB 2.0 connectors (USB ports 3 and 4) 16 Optional serial port (Serial port 2)

8 Ethernet connector 17 DisplayPort connector 2 (optional)

9 Microphone connector

Locating major FRUs and CRUs

Figure 3 “Locating major FRUs and CRUs” on page 69 shows the locations of the various components in
your computer. To remove the computer cover, see “Removing the computer cover” on page 80.

68 ThinkCentre M78 Hardware Maintenance Manual

Figure 3. Locating major FRUs and CRUs

The following table lists the major FRUs shown in Figure 3 “Locating major FRUs and CRUs” on page 69 and
identifies which FRUs also are self-service CRUs or optional-service CRUs.

Notes:

Chapter 8. Locations 69
• Self-service CRUs: These CRUs unplug or are secured by no more than two screws. Examples of
these types of CRUs include the keyboard, the mouse, any USB device, and the power cord. Other
self-service CRUs depending on product design might include memory modules, adapter cards, hard
disk drives, and optical drives.
• Optional-service CRUs: These CRUs are isolated parts within the computer and are concealed by an
access panel that is typically secured by more than two screws. Once the access panel is removed, the
specific CRU is visible.

Number FRU description Self-service CRU Optional-service CRU

1 Power supply assembly No Yes
2 Heat sink and fan assembly No Yes
3 Primary hard disk drive Yes No
4 Front WiFi antenna No Yes
5 Power switch unit No No
6 Optical drive Yes No
7 Front bezel Yes No
8 Internal speaker Yes No
9 Front audio and USB assembly No Yes
10 Front fan assembly No Yes
11 Secondary hard disk drive (optional) Yes No
12 Battery Yes No
13 Peripheral Component Interconnect (PCI) card Yes No
14 WiFi card module No Yes
15 WiFi adapter card No Yes
16 Rear WiFi antenna No No
17 Memory modules Yes No
18 Cover presence switch (intrusion switch) No Yes
19 Rear fan assembly No Yes
20 Microprocessor No Yes

21 System board No No

22 Keyboard Yes No

23 Mouse Yes No

Looking up FRU information

For detailed FRU information, such as the FRU part numbers and supported computer models, go to:
http:/www.lenovo.com/serviceparts-lookup

70 ThinkCentre M78 Hardware Maintenance Manual

Locating parts on the system board
Figure 4 “System board part locations” on page 71 shows the locations of the parts on the system board.

Figure 4. System board part locations

1 4-pin power connector 15 Front panel connector (for connecting LED indicators and
the power switch)
2 Microprocessor 16 Front USB connector 1 (for connecting USB ports 1 and 2
on the front bezel)

3 Microprocessor fan connector 17 Front USB connector 2 (for connecting additional USB
devices)
4 Memory slot 1 (DIMM 1) 18 Clear CMOS (Complementary Metal Oxide Semiconductor)
/Recovery jumper
5 Memory slot 2 (DIMM 2) 19 Serial (COM2) connector

6 Memory slot 3 (DIMM 3) 20 Internal speaker connector

7 Memory slot 4 (DIMM 4) 21 Front audio connector

8 Thermal sensor connector 22 PCI card slots (2)

9 4-pin power connectors (2) 23 PCI Express x1 card slot

10 14-pin power connector 24 PCI Express x16 graphics card slot

11 Battery 25 Cover presence switch connector (Intrusion switch

connector)
12 SATA 3.0 connectors (4) 26 System fan connector

13 Power fan connector 27 DisplayPort connector

14 Parallel connector 28 PS/2 keyboard and mouse connector

Chapter 8. Locations 71
Locating internal drives
Internal drives are devices that your computer uses to read and store data. You can add drives to your
computer to increase storage capacity and enable your computer to read other types of media. Internal
drives are installed in bays. In this manual, the bays are referred to as bay 1, bay 2, and so on.

When installing or replacing an internal drive, it is important to note the type and size of the drive that you
can install or replace in each bay and correctly connect the cables to the drive installed. Refer to the
appropriate section in “Installing or replacing hardware” on page 79 for instructions on how to install or
replace internal drives for your computer.

Figure 5 “Drive bay locations” on page 72 shows the locations of the drive bays.

Figure 5. Drive bay locations

1 Bay 1 - Optical drive bay (with an optical drive installed in some models)

2 Bay 2 - Optical drive bay

3 Bay 3 - Card reader drive bay or mSATA solid state drive bay

4 Bay 4 - Secondary SATA hard disk drive bay (for installing a 3.5-inch SATA hard disk drive or a 2.5-inch SATA solid
state drive)
5 Bay 5 - Primary SATA hard disk drive bay (for installing a 3.5-inch SATA hard disk drive or a 2.5-inch SATA solid
state drive)

72 ThinkCentre M78 Hardware Maintenance Manual

For machine types: 2113, 2114, 2115, 3515, 4860, 4863, 4865, 4866, 4869,
5100, 10BS, 10BT, and 10BU

Locating connectors, controls, and indicators on the front of your

computer
Figure 6 “Front connector, control, and indicator locations” on page 73 shows the locations of the
connectors, controls, and indicators on the front of your computer.

Figure 6. Front connector, control, and indicator locations

1 Optical drive eject/close button 5 USB 2.0 connector (USB port 2)

2 Power switch 6 Microphone connector

3 Hard disk drive activity indicator 7 Headphone connector

4 Power indicator 8 USB 2.0 connector (USB port 1)

Chapter 8. Locations 73
Locating connectors on the rear of your computer
Figure 7 “Rear connector locations” on page 74 shows the locations of the connectors on the rear of your
computer. Some connectors on the rear of your computer are color-coded to help you determine where to
connect the cables on your computer.

Figure 7. Rear connector locations

1 Power cord connector 11 PCI Express x1 card slot

2 Serial port (Serial port 1) 12 PCI card slots (2)

3 VGA monitor connector 13 Optional serial port (Serial port 2)

4 DisplayPort connector 1 14 Cable lock slots (2)

5 USB 3.0 connectors (USB ports 5 to 8) 15 Ethernet connector

6 USB 2.0 connectors (USB ports 3 and 4) 16 Integrated cable lock (Kensington lock) slot

7 Microphone connector 17 Cover-release button

8 Audio line-out connector 18 DisplayPort connector 2 (optional)

9 Audio line-in connector 19 PS/2 keyboard and mouse connectors (optional)

10 PCI Express x16 graphics card slot

Locating major FRUs and CRUs

Figure 8 “Locating major FRUs and CRUs” on page 75 shows the locations of the major FRUs and CRUs in
the computer. To open the computer cover, see “Opening the computer cover” on page 136.

74 ThinkCentre M78 Hardware Maintenance Manual

Figure 8. Locating major FRUs and CRUs

The following table lists the major FRUs shown in Figure 8 “Locating major FRUs and CRUs” on page 75 and
identifies which FRUs also are self-service CRUs or optional-service CRUs.

Notes:
• Self-service CRUs: These CRUs unplug or are secured by no more than two screws. Examples of
these types of CRUs include the keyboard, the mouse, any USB device, and the power cord. Other

Chapter 8. Locations 75
 self-service CRUs depending on product design might include memory modules, adapter cards, hard
disk drives, and optical drives.
• Optional-service CRUs: These CRUs are isolated parts within the computer and are concealed by an
access panel that is typically secured by more than two screws. Once the access panel is removed, the
specific CRU is visible.

Number FRU description Self-service CRU Optional-service CRU

1 Power supply assembly No Yes
2 Heat sink fan duct No Yes
3 Heat sink and fan assembly No Yes
4 Optical drive Yes No
5 Power switch unit No No
6 Front audio and USB assembly No Yes

7 Front bezel Yes No

8 Front fan assembly No Yes

9 Internal speaker Yes Yes
10 Front WiFi antenna No Yes
11 Cover presence switch (intrusion switch) Yes No
12 Battery Yes No
13 Hard disk drive Yes No
14 Memory modules Yes No
15 WiFi card module No Yes
16 WiFi adapter card No Yes
17 Rear WiFi antenna No No
18 Peripheral Component Interconnect (PCI) card Yes No
19 System board No No
20 Microprocessor No Yes
21 Keyboard Yes No
22 Mouse Yes No

Looking up FRU information

For detailed FRU information, such as the FRU part numbers and supported computer models, go to:
http:/www.lenovo.com/serviceparts-lookup

76 ThinkCentre M78 Hardware Maintenance Manual

Locating parts on the system board
Figure 9 “System board part locations” on page 77 shows the locations of the parts on the system board.

Figure 9. System board part locations

1 4-pin power connector 15 Front panel connector (for connecting LED indicators and
the power switch)
2 Microprocessor 16 Front USB connector 1 (for connecting USB ports 1 and 2
on the front bezel)

3 Microprocessor fan connector 17 Front USB connector 2 (for connecting additional USB
devices)
4 Memory slot 1 (DIMM 1) 18 Clear CMOS (Complementary Metal Oxide
Semiconductor)/Recovery jumper
5 Memory slot 2 (DIMM 2) 19 Serial (COM2) connector

6 Memory slot 3 (DIMM 3) 20 Internal speaker connector

7 Memory slot 4 (DIMM 4) 21 Front audio connector

8 Thermal sensor connector 22 PCI card slots (2)

9 4-pin power connectors (2) 23 PCI Express x1 card slot

10 14-pin power connector 24 PCI Express x16 graphics card slot

11 Battery 25 Cover presence switch connector (Intrusion switch

connector)
12 SATA 3.0 connectors (4) 26 System fan connector

13 Power fan connector 27 DisplayPort connector

14 Parallel connector 28 PS/2 keyboard and mouse connector

Chapter 8. Locations 77
Locating internal drives
Internal drives are devices that your computer uses to read and store data. You can add drives to your
computer to increase storage capacity and enable your computer to read other types of media. Internal
drives are installed in bays. In this manual, the bays are referred to as bay 1, bay 2, and so on. Your
computer comes with the following factory-installed drives:
• An optical drive in bay 1
• A 3.5-inch hard disk drive or a 2.5-inch solid state drive in bay 3

When installing or replacing an internal drive, it is important to note the type and size of the drive that you
can install or replace in each bay and correctly connect the cables to the drive installed. Refer to the
appropriate section in “Installing or replacing hardware” on page 135 for instructions on how to install or
replace internal drives for your computer.

Figure 10 “Drive bay locations” on page 78 shows the locations of the drive bays.

Figure 10. Drive bay locations

1 Bay 1 - Optical drive bay (with an optical drive installed)

2 Bay 2 - Card reader drive bay or mSATA solid state drive bay

3 Bay 3 - SATA hard disk drive bay (with a 3.5-inch hard disk drive or a 2.5-inch solid state drive installed)

78 ThinkCentre M78 Hardware Maintenance Manual

Chapter 9. Replacing FRUs (machine types: 1562, 1565, 1662,
1663, 1765, 1766, 2011, 2110, 2111, 2112, 10BN, 10BQ, and 10BR)
This chapter provides information about the FRU replacement instructions.

Important: Be sure to read and understand Chapter 2 “Safety information” on page 3 before replacing any
FRU. These precautions and guidelines will help you work safely.

Note: FRU replacements are to be done only by trained service technicians.

Handling static-sensitive devices

Do not open the static-protective package containing the new part until the defective part has been removed
from the computer and you are ready to install the new part. Static electricity, although harmless to you, can
seriously damage computer components and parts.

When you handle computer parts and components, take these precautions to avoid static-electricity damage:
• Limit your movement. Movement can cause static electricity to build up around you.
• Always carefully handle the parts and other computer components. Handle PCI cards, memory modules,
system boards, and microprocessors by the edges. Never touch exposed circuitry.
• Prevent others from touching the parts and other computer components.
• Before you replace a new part, touch the static-protective package containing the new part to a metal
expansion-slot cover or other unpainted metal surface on the computer for at least two seconds. This
reduces static electricity from the package and your body.
• Remove the new part from the static-protective package and directly install it in the computer without
placing it on any other surface. If it is hard for you to do this in your specific situation, place the
static-protective package of the new part on a smooth, level surface, and then place the new part on
the static-protective package.
• Do not place the part on the computer cover or other metal surface.

Installing or replacing hardware

This section provides instructions on how to install or replace hardware for your computer. You can expand
the capabilities of your computer and maintain your computer by installing or replacing hardware.

Attention:
Do not open your computer or attempt any repair before reading and understanding “Important safety information”
on page 1.

Notes:
1. Use only computer parts provided by Lenovo.
2. When installing or replacing an option, use the appropriate instructions in this section along with the
instructions that come with the option.

Installing external options

You can connect external options to your computer, such as external speakers, a printer, or a scanner. For
some external options, you must install additional software in addition to making the physical connection.
When installing an external option, see “Locating connectors, controls, and indicators on the front of your
computer” on page 73 and “Locating connectors on the rear of your computer” on page 74 to identify the

© Copyright Lenovo 2012, 2014 79

required connector. Then, use the instructions that come with the option to help you make the connection
and install any software or device drivers that are required for the option.

Removing the computer cover

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to remove the computer cover.

CAUTION:

Before you open the computer cover, turn off the computer and wait several minutes until the
computer is cool.

To remove the computer cover, do the following:

1. Remove any media from the drives and turn off all attached devices and the computer.
2. Disconnect all power cords from electrical outlets.
3. Disconnect the power cords, Input/Output cables, and any other cables that are connected to the
computer. See “Locating connectors, controls, and indicators on the front of your computer” on page
67 and “Locating connectors on the rear of your computer” on page 68.
4. Remove any locking device that secures the computer cover, such as a padlock or an integrated
cable lock.
5. Remove any screws that secure the computer cover.

80 ThinkCentre M78 Hardware Maintenance Manual

 6. Press the cover-release button on the side of the computer and slide the cover to the rear of the
computer to remove the cover.

Figure 11. Removing the computer cover

Removing and reinstalling the front bezel

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to remove and reinstall the front bezel.

To remove and reinstall the front bezel, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.

Chapter 9. Replacing FRUs (machine types: 1562, 1565, 1662, 1663, 1765, 1766, 2011, 2110, 2111, 2112, 10BN, 10BQ, and 10BR) 81
 3. Remove the front bezel by releasing the three plastic tabs on the left side and pivoting the front bezel
outward.

Figure 12. Removing the front bezel

4. To reinstall the front bezel, align the three plastic tabs on the right side of the front bezel with the
corresponding holes in the chassis, then pivot the front bezel inwards until it snaps into position on
the left side.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Installing or replacing a PCI card

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or replace a PCI card. Your computer has two standard
PCI card slots, one PCI Express x1 card slot, and one PCI Express x16 graphics card slot.

To install or replace a PCI card, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.

82 ThinkCentre M78 Hardware Maintenance Manual

 3. At the rear of the computer, press the release button 1 to open the card latch 2 .

Figure 13. Opening the PCI card latch

4. Depending on whether you are installing or replacing a PCI card, do one of the following:
• If you are installing a PCI card, remove the appropriate metal slot cover.
• If you are replacing an old PCI card, grasp the old card that is currently installed and gently pull it
out of the slot.

Chapter 9. Replacing FRUs (machine types: 1562, 1565, 1662, 1663, 1765, 1766, 2011, 2110, 2111, 2112, 10BN, 10BQ, and 10BR) 83
 Figure 14. Removing a PCI card

Notes:
a. The card fits tightly into the card slot. If necessary, alternate moving each side of the card a small
amount until it is removed from the card slot.
b. If the card is held in place by a retaining latch, press the card retaining latch 1 as shown to
disengage the latch. Grasp the card and gently pull it out of the slot.

5. Remove the new PCI card from its static-protective package.

6. Install the new card into the appropriate slot on the system board. See “Locating parts on the system
board” on page 71.

Note: If you are installing a PCI Express x16 graphics card, ensure that the memory slot retaining clips
are closed before you install the graphics card.

84 ThinkCentre M78 Hardware Maintenance Manual

 7. Pivot the card latch to the closed position to secure the PCI card.

Figure 15. Installing a PCI card

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Installing or replacing a memory module

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or replace a memory module.

Your computer has four slots for installing or replacing double data rate 3 unbuffered dual inline memory
modules (DDR3 UDIMMs) that provide up to a maximum of 32 GB system memory. When installing or
replacing a memory module, use 2 GB, 4 GB, or 8 GB DDR3 UDIMMs in any combination up to a maximum
of 32 GB.

The following table provides information about the memory module installation rules that you should
consider when installing or removing a memory module. The “X” mark indicates the memory slot(s) into
which the memory module(s) should be installed in different situations. The numbers 1, 2, 3, and 4 indicate
the installation sequence. To locate the memory module slots, see “Locating parts on the system board”
on page 71.

Chapter 9. Replacing FRUs (machine types: 1562, 1565, 1662, 1663, 1765, 1766, 2011, 2110, 2111, 2112, 10BN, 10BQ, and 10BR) 85
 UDIMM DIMM 1 DIMM 2 DIMM 3 DIMM 4
One UDIMM X
Two UDIMMs X, 1 X, 2
Three UDIMMs X, 3 X, 1 X, 2
Four UDIMMs X, 3 X, 1 X, 4 X, 2

To install or replace a memory module, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Lay the computer on its side for easier access to the system board.
4. Locate the memory slots. See “Locating parts on the system board” on page 71.
5. Remove any parts that might prevent your access to the memory slots. Depending on your computer
model, you might need to remove the PCI Express x16 graphics card for easier access to the memory
slots. See “Installing or replacing a PCI card” on page 82.
6. Depending on whether you are installing or replacing a memory module, do one of the following:
• If you are replacing an old memory module, open the retaining clips and gently pull the memory
module out of the memory slot.

Figure 16. Removing a memory module

86 ThinkCentre M78 Hardware Maintenance Manual

 • If you are installing a memory module, open the retaining clips of the memory slot into which you
want to install the memory module.

Figure 17. Opening the retaining clips

7. Position the new memory module over the memory slot. Ensure that the notch 1 on the memory
module aligns correctly with the slot key 2 on the system board. Push the memory module straight
down into the slot until the retaining clips close.

Figure 18. Installing a memory module

8. Reinstall the PCI Express x16 graphics card if you have removed it.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Installing or replacing the optical drive

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or replace the optical drive.

To install or replace an optical drive, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.

Chapter 9. Replacing FRUs (machine types: 1562, 1565, 1662, 1663, 1765, 1766, 2011, 2110, 2111, 2112, 10BN, 10BQ, and 10BR) 87
 2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Depending on whether you are installing or replacing an optical drive, do one of the following:
• If you are installing a secondary optical drive, remove the plastic panel in the front bezel for the
drive bay you want to use. If there is a metal static shield installed in the drive bay, remove the
metal static shield.
• If you are replacing an optical drive, disconnect the signal cable and the power cable from the rear
of the optical drive, press the blue release button, and then slide the optical drive out of the front
of the computer.

Figure 19. Removing the optical drive

5. Install the optical drive retainer on the side of the new optical drive.

Figure 20. Installing the optical drive retainer

88 ThinkCentre M78 Hardware Maintenance Manual

 6. Slide the new optical drive into the drive bay from the front of the computer until the optical drive
snaps into position.

Figure 21. Installing the optical drive

7. Connect the signal cable and the power cable to the new optical drive.

Figure 22. Connecting the optical drive

8. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 81.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Installing or replacing the card reader

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

Chapter 9. Replacing FRUs (machine types: 1562, 1565, 1662, 1663, 1765, 1766, 2011, 2110, 2111, 2112, 10BN, 10BQ, and 10BR) 89
This section provides instructions on how to install or replace the card reader.

Note: The card reader is only available in some models. For new installation, see “Installing the card reader”
on page 90. For replacement, see “Replacing the card reader” on page 92.

Installing the card reader

To install the card reader, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Locate the card reader drive bay. See “Locating internal drives” on page 72.
5. Pivot the card reader retainer to the left and slide it out of the chassis.

Figure 23. Removing the card reader retainer

6. Install the card reader retainer on the side of the new card reader.

Figure 24. Installing the card reader retainer

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 7. Slide the card reader with retainer into the card reader drive bay until it snaps into position.

Figure 25. Installing the card reader

8. Connect the card reader cable to front USB connector 2 on the system board. See “Locating parts on
the system board” on page 71.
9. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 81.

Note: You might have to remove the card reader cover 2 from the front bezel. To remove the card read
cover, pivot the two retaining clips 1 that secure the card reader cover outwards and then completely
disengage the card reader cover from the front bezel.

Figure 26. Removing the card reader cover

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What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the card reader

To replace the card reader, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Locate the card reader. See “Locating major FRUs and CRUs” on page 68.
5. Disconnect the card reader cable from the USB connector on the system board. See “Locating parts on
the system board” on page 71.
6. Press the blue retaining clip to remove the card reader out of the chassis.

Figure 27. Removing the card reader

7. Install the card reader retainer on the side of the new card reader.

Figure 28. Installing the card reader retainer

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 8. Slide the new card reader into the drive bay until it snaps into position.

Figure 29. Installing the card reader

9. Reconnect the card reader cable to front USB connector 2 on the system board. See “Locating parts on
the system board” on page 71.
10. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 81.
11. To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the power switch unit

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the power switch unit.

To replace the power switch unit, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Locate the power switch unit. See “Locating major FRUs and CRUs” on page 68.
5. Disconnect the power switch cable from the front panel connector on the system board. See “Locating
parts on the system board” on page 71.

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 6. Remove the two screws that secure the handle to the top-front edge of the chassis.

Figure 30. Removing the screws for the handle

7. Lift the handle off the chassis and flip the handle over.

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 8. Remove the two screws on the back of the handle. Pull the top of the triangular area on either side of
the front cover and lift the back cover off.

Figure 31. Disassembling the handle

9. Lift the power switch circuit board and the power switch cable from the back cover, release the cable
from the cable clips in the chassis, and then remove the entire power switch unit from the computer
chassis.

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10. Insert the cable of a new power switch unit into the hole 1 . Install the new power switch circuit board
on the back of the handle front cover.

Figure 32. Installing the new power switch unit

11. Assemble the handle back cover and front cover, and install the two screws to secure the front and
back covers together.

Figure 33. Installing the handle back cover

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12. Flip the handle over, align the two feet of the handle with the two holes in the top-front of the chassis.
13. Install the two screws to secure the handle to the chassis.

Figure 34. Installing the screws for the handle

14. Reconnect the power switch cable to the system board and secure the cable with the cable clips in
the chassis. See “Locating parts on the system board” on page 71

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the battery

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

Your computer has a special type of memory that maintains the date, time, and settings for built-in features,
such as parallel-port assignments (configuration). A battery keeps this information active when you turn
off the computer.

The battery normally requires no charging or maintenance throughout its life; however, no battery lasts
forever. If the battery fails, the date, time, and configuration information (including passwords) are lost. An
error message is displayed when you turn on the computer.

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Refer to the “Lithium coin cell battery notice” in the Safety, Warranty, and Setup Guide for information about
replacing and disposing of the battery.

To replace the battery, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Opening the computer cover” on page 136.
3. Locate the battery. See “Locating parts on the system board” on page 71.
4. Remove the old battery.

Figure 35. Removing the old battery

5. Install a new battery.

Figure 36. Installing a new battery

6. Reinstall the computer cover and connect the cables. See “Completing the parts replacement” on
page 132.

Note: When the computer is turned on for the first time after replacing the battery, an error message
might be displayed. This is normal after replacing the battery.
7. Turn on the computer and all attached devices.
8. Use the Setup Utility program to set the date, time, and any passwords. See Chapter 6 “Using the Setup
Utility program” on page 55.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the power supply assembly

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the power supply assembly.

Although there are no moving parts in your computer after the power cord has been disconnected, the
following warnings are required for your safety and proper Underwriters Laboratories (UL) certification.

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CAUTION:

Hazardous moving parts. Keep fingers and other body parts away.

CAUTION:
Never remove the cover on a power supply or any part that has the following label attached.

Hazardous voltage, current, and energy levels are present inside any component that has this label
attached. There are no serviceable parts inside these components. If you suspect a problem with
one of these parts, contact a service technician.

To replace the power supply assembly, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Disconnect the power supply assembly cables from the system board and all drives. See “Locating
parts on the system board” on page 71.
4. Release the power supply assembly cables from the cable clips and ties in the chassis.

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 5. Lay the computer on its side and remove the four screws at the rear of the chassis that secure the
power supply assembly.

Figure 37. Removing the screws for the power supply assembly

6. Slide the power supply assembly to the front of the computer and then lift it out of the chassis.
7. Ensure that the new power supply assembly is the correct replacement.
8. Install the new power supply assembly into the chassis so that the screw holes in the power supply
assembly align with those in the chassis.
9. Install and tighten the four screws to secure the power supply assembly.

Note: Use only screws provided by Lenovo.

10. Reconnect the power supply assembly cables to the system board and each of the drives.
11. Secure the power supply assembly cables with the cable clips and ties in the chassis.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the heat sink and fan assembly

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the heat sink and fan assembly.

CAUTION:

The heat sink and fan assembly might be very hot. Before you open the computer cover, turn off the
computer and wait several minutes until the computer is cool.

To replace the heat sink and fan assembly, do the following:

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1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Lay the computer on its side for easier access to the system board.
4. Locate the heat sink and fan assembly. See “Locating parts on the system board” on page 71.
5. Disconnect the heat sink and fan assembly cable from the microprocessor fan connector on the system
board. See “Locating parts on the system board” on page 71.
6. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the
system board:
a. Partially remove screw 1 , then fully remove screw 2 , and then fully remove screw 1 .
b. Partially remove screw 3 , then fully remove screw 4 , and then fully remove screw 3 .

Note: Carefully remove the four screws from the system board to avoid any possible damage to the
system board. The four screws cannot be removed from the heat sink and fan assembly.

Figure 38. Removing the heat sink and fan assembly

7. Lift the failing heat sink and fan assembly off the system board.

Notes:
a. You might have to gently twist the heat sink and fan assembly to free it from the microprocessor.
b. Do not touch the thermal grease while handling the heat sink and fan assembly.
8. Position the new heat sink and fan assembly on the system board so that the four screws are aligned
with the holes on the system board.

Note: Position the new heat sink and fan assembly so that the heat sink and fan assembly cable is
toward the microprocessor fan connector on the system board.
9. Follow the following sequence to install the four screws to secure the new heat sink and fan assembly.
Do not over-tighten the screws.
a. Partially tighten screw 1 , then fully tighten screw 2 , and then fully tighten screw 1 .

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 b. Partially tighten screw 3 , then fully tighten screw 4 , and then fully tighten screw 3 .
10. Connect the heat sink and fan assembly cable to the microprocessor fan connector on the system
board. See “Locating parts on the system board” on page 71.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the microprocessor

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the microprocessor.

CAUTION:

The heat sink and microprocessor might be very hot. Before you open the computer cover, turn off
the computer and wait several minutes until the computer is cool.

To replace the microprocessor, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Lay the computer on its side for easier access to the system board.
4. Locate the system board and disconnect all cables connected to the system board. See “Locating
parts on the system board” on page 71.
5. Remove the heat sink and fan assembly. See “Replacing the heat sink and fan assembly” on page 100.

Note: Place the heat sink and fan assembly on its side so that the thermal grease on the bottom of it
does not get in contact with anything.

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6. Lift the small handle 1 to release the microprocessor 2 secured on the system board.

Figure 39. Accessing the microprocessor

7. Lift the microprocessor straight up and out of the microprocessor socket.

Figure 40. Removing the microprocessor

Notes:
a. Your microprocessor and socket might look different from the one illustrated.
b. Note the orientation of the microprocessor in the socket. You can look for the small triangle 1
on one corner of the microprocessor. This is important when installing the new microprocessor
on the system board.

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 c. Touch only the edges of the microprocessor. Do not touch the gold contacts on the bottom.
d. Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be
kept as clean as possible.
8. Ensure that the small handle is in the raised position.
9. Remove the protective cover that protects the gold contacts of the new microprocessor.
10. Hold the new microprocessor by its sides and align the small triangle on one corner of the new
microprocessor with the corresponding small triangle on one corner of the microprocessor socket.
11. Lower the new microprocessor straight down into the microprocessor socket on the system board.
12. Lower the small handle to secure the new microprocessor in the socket.
13. Reinstall the heat sink and fan assembly. See “Replacing the heat sink and fan assembly” on page 100.
14. Reconnect all cables that were disconnected from the system board.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the replacement, go to “Completing the parts replacement” on page 132.

Replacing the system board

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the system board.

CAUTION:

The heat sink and microprocessor might be very hot. Before you open the computer cover, turn off
the computer and wait several minutes until the computer is cool.

To replace the system board, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Lay the computer on its side for easier access to the system board.
4. Remove all memory modules and PCI cards that are currently installed. See “Installing or replacing a
memory module” on page 85 and “Installing or replacing a PCI card” on page 82.
5. Carefully take note of the locations of all cable connections on the system board and disconnect all
the cables. See “Locating parts on the system board” on page 71.
6. Remove the heat sink and fan assembly from the failing system board. See “Replacing the heat sink and
fan assembly” on page 100.

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 7. Remove the eight screws that secure the system board.

Figure 41. Removing the eight screws that secure the system board

8. Carefully slide the system board so that it can be released from the mounting studs that secure the
system board in place.
9. Lift the system board out of the chassis.
10. Remove the microprocessor from the failing system board and install it on the new system board. See
“Replacing the microprocessor” on page 102.
11. Install the new system board into the chassis by aligning the eight mounting studs in the chassis with the
corresponding holes in the new system board. Carefully slide the new system board into the chassis until
it is secured in place by the mounting studs. Then, install the eight screws to secure the system board.
12. Install the heat sink and fan assembly and connect the heat sink and fan assembly cable to the new
system board. See “Replacing the heat sink and fan assembly” on page 100.
13. Install all memory modules and PCI cards removed from the failing system board on the new system
board. See “Installing or replacing a memory module” on page 85 and “Installing or replacing a PCI
card” on page 82.
14. Reconnect all remaining cables to the system board. See “Locating parts on the system board”
on page 71.
15. To complete the replacement, go to “Completing the parts replacement” on page 132.

Replacing the primary hard disk drive

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

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This section provides instructions on how to replace the primary hard disk drive.

Note: Depending on your model type, your computer might come with a 2.5-inch solid state drive. To install
the solid state drive, see “Installing the solid state drive” on page 110.

To replace the primary hard disk drive, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Locate the primary hard disk drive. See “Locating internal drives” on page 72.
4. Disconnect the signal cable and the power cable from the hard disk drive.
5. Pull the blue handle to release and remove the hard disk drive from the drive cage.

Figure 42. Removing the primary hard disk drive

6. Flex the sides of the blue bracket to remove the hard disk drive from the bracket.

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 7. To install a new hard disk drive into the blue bracket, flex the bracket and align pin 1 , pin 2 , pin 3 ,
and pin 4 on the bracket with the corresponding holes in the hard disk drive. Do not touch the circuit
board 5 on the bottom of the hard disk drive.

Figure 43. Installing the hard disk drive into the bracket

8. Slide the new hard disk drive into the drive cage until it snaps into position.

Figure 44. Installing the primary hard disk drive

9. Connect the signal cable and the power cable to the new hard disk drive.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

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Replacing the secondary hard disk drive
Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

Note: Your computer comes with a secondary hard disk drive bay for installing or replacing a secondary
3.5-inch hard disk drive or a 2.5-inch solid state drive. To install the solid state drive, see “Installing the
solid state drive” on page 110.

This section provides instructions on how to replace the secondary hard disk drive.

To replace the secondary hard disk drive, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Locate the secondary hard disk drive. See “Locating internal drives” on page 72.
4. Disconnect the signal cable and the power cable from the hard disk drive.
5. Pull the blue handle to release and remove the hard disk drive from the hard disk drive cage.

Figure 45. Removing the secondary hard disk drive

6. Flex the sides of the blue bracket to remove the hard disk drive from the bracket.

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 7. To install a new hard disk drive into the blue bracket, flex the bracket and align pin 1 , pin 2 , pin 3 ,
and pin 4 on the bracket with the corresponding holes in the hard disk drive. Do not touch the circuit
board 5 on the bottom of the hard disk drive.

Figure 46. Installing the hard disk drive into the bracket

8. Slide the new hard disk drive into the hard disk drive cage until it snaps into position.

Figure 47. Installing the secondary hard disk drive

9. Connect the signal cable and the power cable to the new hard disk drive.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

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Installing the solid state drive
Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install the 2.5-inch solid state drive.

To install the solid state drive, do the following:

1. Install the solid state drive into the storage converter. Then, install the four screws to secure the solid
state drive to the storage converter.

Figure 48. Installing the solid state drive into the storage converter

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 2. To install the solid state drive with the storage converter into the 3.5-inch hard disk drive bracket, flex
the bracket and align pin 1 , pin 2 , pin 3 , and pin 4 on the bracket with the corresponding holes in
the storage converter.

Figure 49. Installing the solid state drive with the storage converter into the hard disk drive bracket

3. Connect the signal cable and the power cable to the solid state drive.
4. Install the solid state drive into the desired hard disk drive bay. See “Replacing the primary hard disk
drive” on page 105 or “Replacing the secondary hard disk drive” on page 108.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the front fan assembly

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the front fan assembly.

Note: The front fan assembly is only available in some models.

To replace the front fan assembly, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Disconnect the front fan assembly cable from the power fan connector on the system board. See
“Locating parts on the system board” on page 71.

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 5. The front fan assembly is attached to the chassis by four rubber mounts. Remove the front fan assembly
by breaking or cutting the rubber mounts and gently pulling the front fan assembly out of the chassis.

Note: The new front fan assembly will have four new rubber mounts attached.

Figure 50. Removing the front fan assembly

6. Install the new front fan assembly by aligning the new rubber mounts with the corresponding holes in
the chassis and push the rubber mounts through the holes.

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 7. Pull the tips of the rubber mounts until the front fan assembly is secured in place.

Figure 51. Installing the front fan assembly

8. Connect the front fan assembly cable to the power fan connector on the system board.
9. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 81.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the rear fan assembly

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the rear fan assembly.

To replace the rear fan assembly, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Locate the rear fan assembly. See “Locating major FRUs and CRUs” on page 68.
4. Disconnect the rear fan assembly cable from the system fan connector on the system board. See
“Locating parts on the system board” on page 71.

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 5. The rear fan assembly is attached to the chassis by four rubber mounts. Remove the rear fan assembly
by breaking or cutting the rubber mounts and gently pulling the rear fan assembly out of the chassis.

Note: The new rear fan assembly will have four new rubber mounts attached.

Figure 52. Removing the rear fan assembly

6. Install the new rear fan assembly by aligning the new rubber mounts with the corresponding holes in the
chassis and push the rubber mounts through the holes.

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 7. Pull the tips of the rubber mounts until the rear fan assembly is secured in place.

Figure 53. Installing the rear fan assembly

8. Connect the rear fan assembly cable to the system fan connector on the system board.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the front audio and USB assembly

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the front audio and USB assembly.

To replace the front audio and USB assembly, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Locate the front audio and USB assembly. See “Locating major FRUs and CRUs” on page 68.

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 5. Disconnect the front audio and USB assembly cables from the system board. See “Locating parts on
the system board” on page 71.

Note: Ensure that you note the locations of the cables when you disconnect the cables from the
system board.
6. Remove the screw that secures the front audio and USB assembly bracket to the chassis to remove
the bracket from the chassis.

Figure 54. Removing the screw that secures the front audio and USB assembly to the chassis

7. Remove the two screws that secure the front audio and USB assembly to its bracket and remove the
failing front audio and USB assembly from the bracket.
8. Install a new front audio and USB assembly into the bracket and install the two screws to secure the
front audio and USB assembly to the bracket.
9. Install the front audio and USB assembly bracket into the chassis and align the screw hole in the
bracket with the corresponding hole in the chassis.
10. Install the screw to secure the bracket to the chassis.
11. Reconnect the front audio and USB assembly cables to the front audio connector and the front USB
connector on the system board. See “Locating parts on the system board” on page 71.
12. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 81.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the internal speaker

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the internal speaker.

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Note: The internal speaker is only available on some models.

To replace the internal speaker, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Locate the internal speaker connector on the system board. See “Locating parts on the system board”
on page 71.
4. Disconnect the internal speaker cable from the system board.
5. Push the metal tab 1 on the right side of the internal speaker and slide the internal speaker toward the
right to completely remove it from the chassis.

Figure 55. Removing the old internal speaker

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 6. Position the new internal speaker into the four metal clips 1 and push the internal speaker toward the
left until it is secured in place.

Figure 56. Installing a new internal speaker

7. Connect the internal speaker cable to the system board. See “Locating parts on the system board”
on page 71.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the thermal sensor

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the thermal sensor.

To replace the thermal sensor, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Locate the thermal sensor. See “Locating major FRUs and CRUs” on page 68.
5. Disconnect the thermal sensor cable from the thermal sensor connector on the system board. See
“Locating parts on the system board” on page 71.

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6. From inside the chassis, pivot the upper retaining clip 1 that secures the plastic holder of the thermal
sensor downward and then push the clip outward to release the clip. Then disengage the plastic
holder holding the thermal sensor from the chassis.

Figure 57. Removing the thermal sensor

7. Pull the entire thermal sensor out of the chassis.

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 8. Insert the connector and cable of the new thermal sensor into the lower hole 1 in the chassis. Then
align the two tabs on the plastic holder holding the thermal sensor with the two holes 1 and 2 in the
chassis, and push the plastic holder until it snaps into position.

Figure 58. Installing the new thermal sensor

9. Reconnect the thermal sensor cable to the system board. See “Locating parts on the system board”
on page 71.
10. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 81.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the cover presence switch

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the cover presence switch (intrusion switch).

To replace the cover presence switch, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Locate the cover presence switch. See “Locating major FRUs and CRUs” on page 68.
5. Disconnect the cover presence switch cable from the cover presence switch connector on the system
board. See “Locating parts on the system board” on page 71.

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6. Remove the screw that secures the cover presence switch and remove the cover presence switch
from the chassis.

Figure 59. Removing the cover presence switch

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 7. Position the new cover presence switch so that the screw hole in the cover presence switch is aligned
with the corresponding hole in the chassis. Then install the screw to secure the cover presence
switch to the chassis.

Figure 60. Installing the new cover presence switch

8. Reconnect the cover presence switch cable to the system board. See “Locating parts on the system
board” on page 71.
9. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 81.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the WiFi units

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the WiFi units. The WiFi units include a WiFi adapter
card, a WiFi card module, and a rear WiFi antenna cable.

Replacing the WiFi units involves the following operations:

• “Removing the WiFi adapter card” on page 122
• “Removing the WiFi card module” on page 124
• “Installing the WiFi units” on page 125

Removing the WiFi adapter card

To remove a WiFi adapter card, do the following:

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1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. At the rear of the computer, press the release button 1 to open the PCI card latch 2 .

Figure 61. Opening the PCI card latch

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 4. Grasp the WiFi adapter card that is currently installed and gently pull it out of the slot.

Figure 62. Removing the WiFi adapter card

Note: The card fits tightly into the card slot. If necessary, alternate moving each side of the card a
small amount until it is removed from the card slot.

Removing the WiFi card module

To remove the WiFi card module, do the following:
1. Remove the WiFi adapter card from the computer, and then disconnect the front and rear WiFi antenna
cables from the WiFi card module.

Figure 63. Removing the WiFi antenna cables

124 ThinkCentre M78 Hardware Maintenance Manual

 2. Remove the two screws that secure the WiFi card module to the WiFi adapter card.

Figure 64. Removing the screws that secure the WiFi card module

3. Pull the WiFi card module out of the mini PCI Express slot to remove it from the WiFi adapter card.

Figure 65. Removing the WiFi card module

Installing the WiFi units

To install the WiFi units, do the following:

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 1. Insert the WiFi card module into the mini PCI Express slot, and then install the two screws to secure
the WiFi card module to the WiFi adapter card.

Figure 66. Installing the WiFi card module

126 ThinkCentre M78 Hardware Maintenance Manual

 2. Connect the front antenna cable and rear antenna cable to the WiFi card module.

Figure 67. Installing the WiFi antenna cables

3. Install the WiFi adapter card into the PCI Express x1 slot on the system board. See “Locating parts on
the system board” on page 71.
4. Pivot the card latch to the closed position to secure the WiFi adapter card.

Figure 68. Installing the WiFi adapter card

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

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Installing or removing the rear WiFi antenna
Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or remove the rear WiFi antenna.

Installing the rear WiFi antenna

To install the rear WiFi antenna, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Install the rear WiFi antenna to the rear WiFi antenna cable connector attached on the rear of the
computer.
3. Adjust the angle of the rear antenna to lower the risk of breaking the antenna by accident.

Figure 69. Installing the rear WiFi antenna

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Removing the rear WiFi antenna

To remove the rear WiFi antenna, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Straighten the rear WiFi antenna so that it can be more easily twisted.

128 ThinkCentre M78 Hardware Maintenance Manual

 3. Hold the thicker end of the rear WiFi antenna and unscrew the WiFi antenna from the rear of the
computer.

Figure 70. Removing the rear WiFi antenna

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Installing or removing the front WiFi antenna

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or remove the front WiFi antenna.

Installing the front WiFi antenna

To install the front WiFi antenna, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Peel off the paper that protects the stickers on the front antenna.

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 Figure 71. Peeling off the paper that protects the stickers

5. Stick the front antenna to the front panel as shown. Then insert the front antenna cable through the
hole in the front panel.

Figure 72. Installing the front WiFi antenna

6. Connect the front antenna cable to the WiFi card module.

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What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Removing the front WiFi antenna

To remove the front WiFi antenna, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 80.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Disconnect the front antenna cable from the WiFi card module.
5. Remove the front antenna and cable from the front of the computer.

Figure 73. Removing the front WiFi antenna

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Replacing the keyboard or mouse

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the keyboard or mouse.

To replace the keyboard or mouse, do the following:

1. Remove any media from the drives. Then, turn off all attached devices and the computer.
2. Disconnect all power cords from electrical outlets.
3. Disconnect the old keyboard cable or mouse cable from the computer.

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 4. Connect a new keyboard or mouse to one of the USB connectors on the computer. Depending on
where you want to connect the new keyboard or mouse, see “Locating connectors, controls, and
indicators on the front of your computer” on page 67 or “Locating connectors on the rear of your
computer” on page 68.

Figure 74. Connecting the USB keyboard or mouse

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 132.

Completing the parts replacement

After completing the installation or replacement for all parts, you need to reinstall the computer cover and
reconnect cables. Depending on the parts you installed or replaced, you might need to confirm the updated
information in the Setup Utility program. Refer to Chapter 6 “Using the Setup Utility program” on page 55.

To reinstall the computer cover and reconnect cables to your computer, do the following:
1. Ensure that all components have been reassembled correctly and that no tools or loose screws are left
inside your computer. See “Locating major FRUs and CRUs” on page 68 for the locations of various
components in your computer.
2. If you have removed the front bezel, reinstall it. See “Removing and reinstalling the front bezel” on
page 81.
3. Ensure that the cables are routed correctly before reinstalling the computer cover. Keep cables clear of
the hinges and sides of the computer chassis to avoid interference with reinstalling the computer cover.

132 ThinkCentre M78 Hardware Maintenance Manual

 4. Position the computer cover on the chassis so that the rail guides on the bottom of the computer
cover engage the rails on the chassis. Then, push the cover to the front of the computer until it snaps
into position.

Figure 75. Reinstalling the computer cover

5. Install the screws to secure the computer cover.

6. If there is a padlock available, lock the computer cover.
7. If there is an integrated cable lock available, lock the computer.
8. Reconnect the external cables and power cords to the computer. See “Locating connectors on the
rear of your computer” on page 68.
9. To update your configuration, refer to Chapter 6 “Using the Setup Utility program” on page 55.

Note: In most areas of the world, Lenovo requires the return of the defective Customer Replaceable Unit
(CRU). Information about this will come with the CRU or will come a few days after the CRU arrives.

Obtaining device drivers

You can obtain device drivers for operating systems that are not preinstalled at
http://www.lenovo.com/support. Installation instructions are provided in readme files with the device-driver
files.

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134 ThinkCentre M78 Hardware Maintenance Manual
Chapter 10. Replacing FRUs (machine types: 2113, 2114, 2115,
3515, 4860, 4863, 4865, 4866, 4869, 5100, 10BS, 10BT, and 10BU)
This chapter provides information about the FRU replacement instructions.

Important: Be sure to read and understand Chapter 2 “Safety information” on page 3 before replacing any
FRU. These precautions and guidelines will help you work safely.

Note: FRU replacements are to be done only by trained service technicians.

Handling static-sensitive devices

Do not open the static-protective package containing the new part until the defective part has been removed
from the computer and you are ready to install the new part. Static electricity, although harmless to you, can
seriously damage computer components and parts.

When you handle computer parts and components, take these precautions to avoid static-electricity damage:
• Limit your movement. Movement can cause static electricity to build up around you.
• Always carefully handle the parts and other computer components. Handle PCI cards, memory modules,
system boards, and microprocessors by the edges. Never touch exposed circuitry.
• Prevent others from touching the parts and other computer components.
• Before you replace a new part, touch the static-protective package containing the new part to a metal
expansion-slot cover or other unpainted metal surface on the computer for at least two seconds. This
reduces static electricity from the package and your body.
• Remove the new part from the static-protective package and directly install it in the computer without
placing it on any other surface. If it is hard for you to do this in your specific situation, place the
static-protective package of the new part on a smooth, level surface, and then place the new part on
the static-protective package.
• Do not place the part on the computer cover or other metal surface.

Installing or replacing hardware

Attention:
Do not open your computer or attempt any repair before reading and understanding “Important safety information”
on page 1.

This section provides instructions on how to install or replace hardware for your computer. You can expand
the capabilities of your computer and maintain your computer by installing or replacing hardware.

Notes:
1. Use only computer parts provided by Lenovo.
2. When installing or replacing an option, use the appropriate instructions in this section along with the
instructions that come with the option.

Installing external options

You can connect external options to your computer, such as external speakers, a printer, or a scanner. For
some external options, you must install additional software in addition to making the physical connection.
When installing an external option, see “Locating connectors, controls, and indicators on the front of your
computer” on page 73 and “Locating connectors on the rear of your computer” on page 74 to identify the

© Copyright Lenovo 2012, 2014 135

required connector. Then, use the instructions that come with the option to help you make the connection
and install any software or device drivers that are required for the option.

Opening the computer cover

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to open the computer cover.

CAUTION:

Before you open the computer cover, turn off the computer and wait several minutes until the
computer is cool.

To open the computer cover, do the following:

1. Remove any media from the drives and turn off all attached devices and the computer.
2. Disconnect all power cords from electrical outlets.
3. Disconnect the power cords, Input/Output cables, and any other cables that are connected to the
computer. See “Locating connectors, controls, and indicators on the front of your computer” on page
73 and “Locating connectors on the rear of your computer” on page 74.
4. Remove any locking device that secures the computer cover, such as an integrated cable lock.
5. Press the cover-release button at the rear of the computer and pivot the computer cover upward.

Figure 76. Opening the computer cover

Removing and reinstalling the front bezel

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to remove and reinstall the front bezel.

To remove and reinstall the front bezel, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.

136 ThinkCentre M78 Hardware Maintenance Manual

2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel by releasing the three plastic tabs on the top of the front bezel and pivoting the
front bezel outward to remove it from the computer.

Figure 77. Removing the front bezel

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 4. To reinstall the front bezel, align the other three plastic tabs on the bottom of the front bezel with the
corresponding holes in the chassis, then pivot the front bezel inward until it snaps into position.

Figure 78. Reinstalling the front bezel

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Accessing the system board components and drives

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to access the system board components and drives.

To access the system board components and drives, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 81.
4. Remove the heat sink fan duct. See “Replacing the heat sink and fan assembly” on page 100.
5. Remove the hard disk drive. See “Replacing the primary hard disk drive” on page 105.
6. Pivot the optical drive bay upward to access the system board components and the cables. See
“Replacing the optical drive” on page 156.

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Installing or replacing a memory module
Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or replace a memory module.

Your computer has four slots for installing or replacing DDR3 UDIMMs that provide up to a maximum of
32 GB system memory. When installing or replacing a memory module, use 2 GB, 4 GB, or 8 GB DDR3
UDIMMs in any combination up to a maximum of 32 GB.

The following table provides information about the memory module installation rules that you should
consider when installing or removing a memory module. The “X” mark indicates the memory slot(s) into
which the memory module(s) should be installed in different situations. The numbers 1, 2, 3, and 4 indicate
the installation sequence. To locate the memory module slots, see “Locating parts on the system board”
on page 71.

UDIMM DIMM 1 DIMM 2 DIMM 3 DIMM 4

One UDIMM X
Two UDIMMs X, 1 X, 2
Three UDIMMs X, 3 X, 1 X, 2
Four UDIMMs X, 3 X, 1 X, 4 X, 2

To install or replace a memory module, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Remove the heat sink fan duct. See “Replacing the heat sink and fan assembly” on page 100.
5. Remove the hard disk drive. See “Replacing the hard disk drive” on page 151.
6. Pivot the optical drive bay upward to gain access to the memory slots. See “Replacing the optical
drive” on page 156.
7. Locate the memory slots. See “Locating parts on the system board” on page 71.
8. Remove any parts that might prevent access to the memory slots.
9. Depending on whether you are installing or replacing a memory module, do one of the following:

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 • If you are replacing an old memory module, open the retaining clips and gently pull the memory
module out of the memory slot.

Figure 79. Removing a memory module

• If you are installing a memory module, open the retaining clips of the memory slot into which you
want to install the memory module.

Figure 80. Opening the retaining clips

140 ThinkCentre M78 Hardware Maintenance Manual

10. Position the new memory module over the memory slot. Ensure that the notch 1 on the memory
module aligns correctly with the slot key 2 on the system board. Push the memory module straight
down into the slot until the retaining clips close.

Figure 81. Installing a memory module

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Installing or replacing a PCI card

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or replace a PCI card. Your computer has two standard
PCI card slots, one PCI Express x1 card slot, and one PCI Express x16 graphics card slot.

To install or replace a PCI card, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Rotate the PCI card retainer to the open position.
4. Depending on whether you are installing or replacing a PCI card, do one of the following:
• If you are installing a PCI card, remove the appropriate metal slot cover.
• If you are replacing an old PCI card, grasp the old card that is currently installed and gently pull it
out of the slot.

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 Figure 82. Removing a PCI card

Notes:
a. The card fits tightly into the card slot. If necessary, alternate moving each side of the card a small
amount until it is removed from the card slot.
b. If the card is held in place by a retaining latch, press the card retaining latch 1 as shown to
disengage the latch. Grasp the card and gently pull it out of the slot.

5. Remove the new PCI card from its static-protective package.

142 ThinkCentre M78 Hardware Maintenance Manual

 6. Install the new card into the appropriate card slot on the system board and rotate the card retainer to the
closed position. See “Locating parts on the system board” on page 71.

Figure 83. Installing the PCI card

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Installing or replacing the card reader

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or replace the card reader.

Note: The card reader is only available in some models. For new installation, see “Installing the card reader”
on page 143. For replacement, see “Replacing the card reader” on page 146.

Installing the card reader

To install the card reader, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Locate the card reader drive bay. See “Locating internal drives” on page 78.

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 Note: You might have to remove the metal cover of the card reader drive bay.
5. Install the new card reader into the card reader bracket. Then install the two screws to secure the
card reader to the bracket.
6. Install the card reader bracket to the chassis. Then push the bracket to the left to align the screw hole in
the bracket with the corresponding hole in the chassis.

Figure 84. Installing the card reader

144 ThinkCentre M78 Hardware Maintenance Manual

 7. Install the screw to secure the card reader bracket to the chassis.

Figure 85. Installing the screw that secures the card reader

8. Connect the card reader cable to one of the USB connectors on the system board. See “Locating
parts on the system board” on page 71.
9. Pivot the optical drive bay downward until it snaps into position.
10. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 136.

Note: You might have to remove the card reader cover 2 from the front bezel. To remove the card read
cover, pivot the two retaining clips 1 that secure the card reader cover outwards and then completely
disengage the card reader cover from the front bezel.

Figure 86. Removing the card reader cover

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

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Replacing the card reader
To replace the card reader, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Locate the card reader drive bay. See “Locating internal drives” on page 78.
5. Pivot the optical drive bay upward and disconnect the card reader cable from the USB connector on the
system board. See “Locating parts on the system board” on page 71.
6. Remove the screw that secures the card reader bracket. Then, remove the card reader bracket from
the chassis.

Figure 87. Removing the screw that secures the card reader

7. Remove the two screws that secure the card reader to its bracket. Then remove the failing card reader
from the bracket.
8. Install a new card reader into the bracket and install the two screws to secure the card reader to the
bracket.

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9. Install the card reader bracket to the chassis. Then push the bracket to the left to align the screw hole in
the bracket with the corresponding hole in the chassis.

Figure 88. Installing the card reader

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10. Install the screw to secure the card reader bracket to the chassis.

Figure 89. Installing the screw that secures the card reader

11. Reconnect the card reader cable to one of the USB connectors on the system board. See “Locating
parts on the system board” on page 71.
12. Pivot the optical drive bay downward until it snaps into position.
13. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 136.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Replacing the power switch unit

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the power switch unit.

To replace the power switch unit, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Locate the power switch unit. See “Locating major FRUs and CRUs” on page 74.

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5. Pivot the optical drive upward and disconnect the power switch cable from the front panel connector on
the system board. See “Locating parts on the system board” on page 77.
6. Push the power switch unit inward through the hole to disengage it from the chassis.

Figure 90. Removing the power switch unit

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 7. Insert the two plastic tabs in the new power switch unit through the hole on the chassis, and then press
the power switch unit as shown until it snaps into position.

Figure 91. Installing the new power switch unit

8. Reconnect the power switch cable to the system board. See “Locating parts on the system board”
on page 77.
9. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 136.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Replacing the battery

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

Your computer has a special type of memory that maintains the date, time, and settings for built-in features,
such as parallel-port assignments (configuration). A battery keeps this information active when you turn
off the computer.

The battery normally requires no charging or maintenance throughout its life; however, no battery lasts
forever. If the battery fails, the date, time, and configuration information (including passwords) are lost. An
error message is displayed when you turn on the computer.

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Refer to the “Lithium coin cell battery notice” in the Safety, Warranty, and Setup Guide for information about
replacing and disposing of the battery.

To replace the battery, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Pivot the drive bay assembly upward to access the system board.
4. Locate the battery. See “Locating parts on the system board” on page 77.
5. Remove the old battery.

Figure 92. Removing the old battery

6. Install a new battery.

Figure 93. Installing a new battery

7. Close the computer cover and connect the cables. See “Completing the parts replacement” on
page 187.

Note: When the computer is turned on for the first time after replacing the battery, an error message
might be displayed. This is normal after replacing the battery.
8. Turn on the computer and all attached devices.
9. Use the Setup Utility program to set the date, time, and any passwords. See Chapter 6 “Using the Setup
Utility program” on page 55.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Replacing the hard disk drive

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the hard disk drive.

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Note: Depending on your model type, your computer might come with a 2.5-inch solid state drive. To install
the solid state drive, see “Installing the solid state drive” on page 110.

To replace the hard disk drive, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Locate the hard disk drive. See “Locating major FRUs and CRUs” on page 68.
4. Pull on the handle of the hard disk drive bracket as shown and then lift the hard disk drive bracket
up from the optical drive bay.

Figure 94. Removing the hard disk drive

5. Disconnect the signal cable and the power cable from the hard disk drive to completely remove the hard
disk drive from the chassis.

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6. Flex the retaining clips as shown to remove the hard disk drive from the bracket.

Figure 95. Removing the hard disk drive from the bracket

7. To install a new hard disk drive into the bracket, flex the bracket and align pin 1 , pin 2 , pin 4 , and pin
5 on the bracket with the corresponding holes in the hard disk drive.

Important: Do not touch the circuit board 3 on the bottom of the hard disk drive.

8. Connect the signal cable and the power cable to the new hard disk drive.

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 9. Insert the two retaining clips 1 of the hard disk drive bracket into the corresponding holes in the side
of the optical drive bay, and then pivot the hard disk drive and bracket downwards until the hard
disk drive bracket snaps into position.

Figure 96. Installing the hard disk drive

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Installing the solid state drive

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install the 2.5-inch solid state drive into the 3.5-inch hard
disk drive bracket.

To install the solid state drive, do the following:

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 1. Install the solid state drive into the adapter. Then, install the four screws to secure the solid state
drive to the adapter.

Figure 97. Installing the solid state drive into the adapter

2. To install the solid state drive with the adapter into the 3.5-inch hard disk drive bracket, flex the bracket
and align pin 1 , pin 2 , pin 3 , and pin 4 on the bracket with the corresponding holes in the adapter.

Figure 98. Installing the solid state drive with the adapter into the hard disk drive bracket

3. Connect the signal cable and the power cable to the solid state drive.
4. Install the solid state drive into the hard disk drive bay. See “Replacing the hard disk drive” on page 151.

What to do next:
• To work with another piece of hardware, go to the appropriate section.

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4869, 5100, 10BS, 10BT, and 10BU) 155
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Replacing the optical drive

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the optical drive.

To replace the optical drive, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Remove the hard disk drive. See “Replacing the hard disk drive” on page 151.
5. Press the blue retaining clip to pivot the optical drive bay upward.

Figure 99. Pivoting the optical drive bay

6. Disconnect the signal cable and the power cable from the rear of the optical drive.

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7. Press the optical drive lock 1 and slide the optical drive out of the rear of the drive bay assembly.

Figure 100. Removing the old optical drive

8. Install the optical drive retainer on the side of the new optical drive.

Figure 101. Installing the optical drive retainer

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 9. Slide the new optical drive into the drive bay until it snaps into position.

Figure 102. Installing a new optical drive

10. Connect the signal cable and the power cable to the rear of the optical drive.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Replacing the heat sink and fan assembly

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the heat sink and fan assembly.

CAUTION:

The heat sink and fan assembly might be very hot. Before you open the computer cover, turn off the
computer and wait several minutes until the computer is cool.

To replace the heat sink and fan assembly, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Open the computer cover. See “Opening the computer cover” on page 136.

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3. Disconnect the heat sink and fan assembly cable from the microprocessor fan connector on the system
board. See “Locating parts on the system board” on page 71.
4. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the
system board:
a. Partially remove screw 1 , then fully remove screw 2 , and then fully remove screw 1 .
b. Partially remove screw 3 , then fully remove screw 4 , and then fully remove screw 3 .

Note: Carefully remove the four screws from the system board to avoid any possible damage to the
system board. The four screws cannot be removed from the heat sink and fan assembly.

Figure 103. Screws that secure the heat sink and fan assembly

5. Lift the heat sink and fan assembly with the fan duct off the system board.

Notes:
a. You might have to gently twist the heat sink and fan assembly to free it from the microprocessor.
b. When handling the heat sink and fan assembly, do not touch the thermal grease on the bottom
of the heat sink and fan assembly.

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 6. Remove the two screws that secure the heat sink fan duct. Then remove the heat sink fan duct from
the failing heat sink and fan assembly.

Figure 104. Removing the heat sink fan duct

7. Place the new heat sink and fan assembly on the system board so that the four screws are aligned
with the corresponding holes in the system board. Ensure that you properly place the new heat sink
and fan assembly so that you can easily connect the new heat sink and fan assembly cable to the
microprocessor fan connector on the system board.
8. Follow this sequence to install the four screws to secure the new heat sink and fan assembly, as shown
in Figure 103 “Screws that secure the heat sink and fan assembly” on page 159:
a. Partially tighten screw 1 , then fully tighten screw 2 , and then fully tighten screw 1 .
b. Partially tighten screw 3 , then fully tighten screw 4 , and then fully tighten screw 3 .
9. Connect the new heat sink and fan assembly cable to the microprocessor fan connector on the system
board. See “Locating parts on the system board” on page 77.

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10. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until the two
screw holes in the heat sink fan duct are aligned with those in the heat sink and fan assembly. Install
the two screws to secure the heat sink fan duct.

Figure 105. Installing the heat sink fan duct

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the replacement, go to “Completing the parts replacement” on page 187.

Replacing the power supply assembly

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the power supply assembly.

Although there are no moving parts in your computer after the power cord has been disconnected, the
following warnings are required for your safety and proper Underwriters Laboratories (UL) certification.

CAUTION:

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Hazardous moving parts. Keep fingers and other body parts away.

CAUTION:
Never remove the cover on a power supply or any part that has the following label attached.

Hazardous voltage, current, and energy levels are present inside any component that has this label
attached. There are no serviceable parts inside these components. If you suspect a problem with
one of these parts, contact a service technician.

To replace the power supply assembly, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Remove the hard disk drive. See “Replacing the hard disk drive” on page 151.

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5. Remove the two screws that secure the heat sink fan duct, and then lift the heat sink fan duct out of
the chassis.

Figure 106. Removing the heat sink fan duct

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 6. Pivot the optical drive upward and disconnect the power supply assembly cables from all drives and
from power connectors 1 , 2 and 3 on the system board.

Figure 107. Power connectors on the system board

Note: You might also need to release the power supply assembly cables from some cable clips or ties
that secure the cables to the chassis. Ensure that you note the cable routing before disconnecting
the cables.

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 7. At the rear of the computer, remove the three screws that secure the power supply assembly. Press the
power supply clip 1 downward to release the power supply assembly and then slide the power supply
assembly to the front of the computer. Lift the power supply assembly out of the computer.

Figure 108. Removing the power supply assembly

8. Ensure that the new power supply assembly is the correct replacement.
9. Install the new power supply assembly into the chassis so that the screw holes in the new power supply
assembly are aligned with the corresponding holes in the rear of the chassis. Then, install the three
screws to secure the new power supply assembly in place.

Note: Use only screws provided by Lenovo.

Figure 109. Installing the power supply assembly

10. Connect the new power supply assembly cables to all drives and the system board. See “Locating
parts on the system board” on page 77.

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11. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until the two
screw holes in the heat sink fan duct are aligned with those in the heat sink and fan assembly. Install
the two screws to secure the heat sink fan duct.

Figure 110. Installing the heat sink fan duct

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the replacement, go to “Completing the parts replacement” on page 187.

Replacing the microprocessor

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the microprocessor.

CAUTION:

The heat sink and microprocessor might be very hot. Before you open the computer cover, turn off
the computer and wait several minutes until the computer is cool.

To replace the microprocessor, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Open the computer cover. See “Opening the computer cover” on page 136.

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3. Locate the system board and disconnect all cables connected to the system board. See “Locating
parts on the system board” on page 77.
4. Remove the heat sink and fan assembly with the fan duct. See “Replacing the heat sink and fan
assembly” on page 158.

Note: Do not let the thermal grease on the bottom of the heat sink and fan assembly get in contact
with anything.
5. Lift the small handle 1 to release the microprocessor 2 secured on the system board.

Figure 111. Accessing the microprocessor

6. Lift the microprocessor straight up and out of the microprocessor socket.

Figure 112. Removing the microprocessor

Notes:
a. Your microprocessor and socket might look different from the one illustrated.

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 b. Note the orientation of the microprocessor in the socket. You can look for the small triangle 1
on one corner of the microprocessor. This is important when installing the new microprocessor
on the system board.

c. Touch only the edges of the microprocessor. Do not touch the gold contacts on the bottom.
d. Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be
kept as clean as possible.
7. Ensure that the small handle is in the raised position.
8. Remove the protective cover that protects the gold contacts of the new microprocessor.
9. Hold the new microprocessor by its sides and align the small triangle on one corner of the new
microprocessor with the corresponding small triangle on one corner of the microprocessor socket.
10. Lower the new microprocessor straight down into the microprocessor socket on the system board.
11. Lower the small handle to secure the new microprocessor in the socket.
12. Reinstall the heat sink and fan assembly with the fan duct as shown. See “Replacing the heat sink and
fan assembly” on page 158.

Figure 113. Reinstalling the heat sink and fan assembly with the fan duct

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13. Reconnect all cables that were disconnected from the system board.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the replacement, go to “Completing the parts replacement” on page 187.

Replacing the system board

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the system board.

CAUTION:

The heat sink and microprocessor might be very hot. Before you open the computer cover, turn off
the computer and wait several minutes until the computer is cool.

To replace the system board, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Pivot the optical drive bay assembly upward to gain access to the system board. See “Accessing the
system board components and drives” on page 138.
5. Remove all memory modules and PCI cards that are currently installed. See “Installing or replacing a
memory module” on page 139 and “Installing or replacing a PCI card” on page 141.
6. Remove the heat sink and fan assembly from the failing system board. See “Replacing the heat sink and
fan assembly” on page 158.
7. Carefully take note of the location of all cable connections on the system board and disconnect all the
cables. See “Locating parts on the system board” on page 77.

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 8. Remove the eight screws that secure the system board.

Figure 114. Removing the eight screws that secure the system board

9. Lift the system board out of the chassis.

10. Remove the microprocessor from the failing system board and install it on the new system board. See
“Replacing the microprocessor” on page 166.
11. Install the new system board into the chassis by aligning the eight mounting studs in the chassis with the
corresponding holes in the new system board. Then, install the eight screws to secure the system board.
12. Install the heat sink and fan assembly and connect the heat sink and fan assembly cable to the new
system board. See “Replacing the heat sink and fan assembly” on page 158.
13. Install all memory modules and PCI cards removed from the failing system board on the new system
board. See “Installing or replacing a memory module” on page 139 and “Installing or replacing a
PCI card” on page 141.
14. Reconnect all remaining cables to the system board. See “Locating parts on the system board”
on page 77.
15. Lower the optical drive bay assembly.
16. To complete the replacement, go to “Completing the parts replacement” on page 187.

Replacing the cover presence switch

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the cover presence switch (intrusion switch).

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To replace the cover presence switch, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Locate the cover presence switch. See “Locating major FRUs and CRUs” on page 74.
5. Disconnect the cover presence switch cable from the cover presence switch connector on the system
board. See “Locating parts on the system board” on page 77.
6. Remove the screw that secures the cover presence switch and remove the cover presence switch
from the chassis.

Figure 115. Removing the cover presence switch

7. Position the new cover presence switch so that the screw hole in the cover presence switch is aligned
with the corresponding hole in the chassis.

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 8. Install the screw to secure the cover presence switch to the chassis.

Figure 116. Installing the new cover presence switch

9. Reconnect the cover presence switch cable to the system board. See “Locating parts on the system
board” on page 77.
10. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 136.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Replacing the internal speaker

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the internal speaker.

Note: The internal speaker is only available in some models.

To replace the internal speaker, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.

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2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Locate the internal speaker. See “Locating major FRUs and CRUs” on page 74.
5. Disconnect the internal speaker cable from the internal speaker connector on the system board. See
“Locating parts on the system board” on page 77.
6. Remove the cover presence switch (intrusion switch). See “Replacing the cover presence switch” on
page 170.
7. Push the internal speaker outward through the hole 1 to disengage it from the two metal tabs on the
chassis. Then, slide the internal speaker to the right to remove it from the chassis.

Figure 117. Removing the internal speaker

8. Align the new internal speaker with the two metal clips on the chassis, and then slide the speaker
as shown until it snaps into position.

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 Figure 118. Installing the new internal speaker

9. Reconnect the internal speaker cable to the system board. See “Locating parts on the system board”
on page 77.
10. Reinstall the cover presence switch. See “Replacing the cover presence switch” on page 170.
11. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 136.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Replacing the thermal sensor

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the thermal sensor.

To replace the thermal sensor, do the following:

1. Turn off the computer and disconnect all power cords from electrical outlets.

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2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Locate the thermal sensor. See “Locating major FRUs and CRUs” on page 74.
5. Disconnect the thermal sensor cable from the thermal sensor connector on the system board. See
“Locating parts on the system board” on page 71.
6. Remove the cover presence switch (intrusion switch). See “Replacing the cover presence switch” on
page 170.
7. Remove the internal speaker. See “Replacing the internal speaker” on page 172.
8. From inside the chassis, pivot the left retaining clip 1 that secures the plastic holder of the thermal
sensor and then push the clip outward to release the clip. Then disengage the plastic holder holding
the thermal sensor from the chassis.

Figure 119. Removing the thermal sensor

9. Pull the entire thermal sensor out of the chassis.

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10. Insert the connector and cable of the new thermal sensor into the left hole 1 in the chassis. Then align
the two tabs on the plastic holder holding the thermal sensor with the two holes 1 and 2 in the chassis,
and push the plastic holder until it snaps into position.

Figure 120. Installing the new thermal sensor

11. Reconnect the thermal sensor cable to the system board. See “Locating parts on the system board”
on page 71.
12. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 136.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Replacing the front audio and USB assembly

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

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This section provides instructions on how to replace the front audio and USB assembly.

To replace the front audio and USB assembly, do the following:

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Pivot the optical drive bay upward and disconnect the front audio and USB assembly cables from the
system board and note the cables routing. See “Locating parts on the system board” on page 77.
5. Remove the screw that secures the front audio and USB assembly bracket. Then remove the front
audio and USB assembly bracket from the chassis.

Figure 121. Removing the front audio and USB assembly

6. Remove the two screws that secure the front audio and USB assembly to its bracket. Then remove the
failing front audio and USB assembly from the bracket.
7. Install a new front audio and USB assembly into the bracket and install the two screws to secure the
front audio and USB assembly to the bracket.
8. Install the front audio and USB assembly bracket to the chassis and align the screw hole in the bracket
with the corresponding hole in the chassis.
9. Install the screw to secure the front audio and USB assembly bracket to the chassis.
10. Reconnect the front USB and front audio cables to the system board. See “Locating parts on the
system board” on page 77.
11. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 136.

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What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Replacing the WiFi units

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the WiFi units. The WiFi units include a WiFi adapter
card, a WiFi card module, and a rear WiFi antenna cable.

Replacing the WiFi units involves the following operations:

• “Removing the WiFi adapter card” on page 178
• “Removing the WiFi card module” on page 179
• “Installing the WiFi units” on page 180

Removing the WiFi adapter card

To remove the WiFi adapter card, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Rotate the PCI card retainer to the open position.

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 4. Grasp the WiFi adapter card that is currently installed and gently pull it out of the slot.

Figure 122. Removing the WiFi adapter card

Note: The card fits tightly into the card slot. If necessary, alternate moving each side of the card a
small amount until it is removed from the card slot.

Removing the WiFi card module

To remove the WiFi card module, do the following:
1. Remove the WiFi adapter card from the computer, and then disconnect the front and rear WiFi antenna
cables from the WiFi card module.

Figure 123. Removing the WiFi antenna cables

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 2. Remove the two screws that secure the WiFi card module to the WiFi adapter card.

Figure 124. Removing the screws that secure the WiFi card module

3. Pull the WiFi card module out of the mini PCI Express slot to remove it from the WiFi adapter card.

Figure 125. Removing the WiFi card module

Installing the WiFi units

To install the WiFi units, do the following:

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1. Insert the WiFi card module into the mini PCI Express slot, and then install the two screws to secure
the WiFi card module to the WiFi adapter card.

Figure 126. Installing the WiFi card module

2. Connect the front antenna cable and rear antenna cable to the WiFi card module.

Figure 127. Connecting the WiFi antenna cables

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 3. Install the WiFi adapter card into the PCI Express x1 slot on the system board. See “Locating parts on
the system board” on page 77.
4. Pivot the card latch to the closed position to secure the WiFi adapter card.

Figure 128. Installing the WiFi adapter card

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Installing or removing the rear WiFi antenna

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or remove the rear WiFi antenna.

Installing the rear WiFi antenna

To install the rear WiFi antenna, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Install the rear WiFi antenna to the rear WiFi antenna cable connector attached on the rear of the
computer.
3. Adjust the angle of the rear antenna to lower the risk of breaking the antenna by accident.

182 ThinkCentre M78 Hardware Maintenance Manual

 Figure 129. Installing the rear WiFi antenna

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Removing the rear WiFi antenna

To remove the rear WiFi antenna, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Straighten the rear WiFi antenna so that it can be more easily twisted.

Chapter 10. Replacing FRUs (machine types: 2113, 2114, 2115, 3515, 4860, 4863, 4865, 4866,
4869, 5100, 10BS, 10BT, and 10BU) 183
 3. Hold the thicker end of the rear WiFi antenna and unscrew the WiFi antenna from the rear of the
computer.

Figure 130. Removing the rear WiFi antenna

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Installing or removing the front WiFi antenna

Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to install or remove the front WiFi antenna.

Installing the front WiFi antenna

To install the front WiFi antenna, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Remove the hard disk drive. See “Replacing the hard disk drive” on page 151.
5. Peel off the paper that protects the stickers on the front antenna.

184 ThinkCentre M78 Hardware Maintenance Manual

 Figure 131. Peeling off the paper that protects the stickers

6. Stick the front antenna to the front panel as shown. Then insert the front antenna cable through the
hole in the front panel.

Figure 132. Installing the front WiFi antenna

Chapter 10. Replacing FRUs (machine types: 2113, 2114, 2115, 3515, 4860, 4863, 4865, 4866,
4869, 5100, 10BS, 10BT, and 10BU) 185
 7. Connect the front antenna cable to the WiFi card module.
8. Reinstall the hard disk drive. See “Replacing the hard disk drive” on page 151.

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Removing the front WiFi antenna

To remove the front WiFi antenna, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 136.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 136.
4. Remove the hard disk drive. See “Replacing the hard disk drive” on page 151.
5. Disconnect the front antenna cable from the WiFi card module.
6. Remove the front antenna and cable from the front of the computer.

Figure 133. Removing the front WiFi antenna

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

186 ThinkCentre M78 Hardware Maintenance Manual

Replacing the keyboard or mouse
Attention: Do not open your computer or attempt any repair before reading and understanding Chapter 2
“Safety information” on page 3.

This section provides instructions on how to replace the keyboard or mouse.

To replace the keyboard or mouse, do the following:

1. Remove any media from the drives. Then, turn off all attached devices and the computer.
2. Disconnect all power cords from electrical outlets.
3. Disconnect the old keyboard cable or mouse cable from the computer.
4. Connect a new keyboard or mouse to one of the USB connectors on the computer. Depending on
where you want to connect the new keyboard or mouse, see “Locating connectors, controls, and
indicators on the front of your computer” on page 73 or “Locating connectors on the rear of your
computer” on page 74.

Figure 134. Connecting a new keyboard or mouse

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 187.

Completing the parts replacement

After completing the installation or replacement for all parts, you need to close the computer cover and
reconnect cables. Depending on the parts you installed or replaced, you might need to confirm the updated
information in the Setup Utility program. Refer to Chapter 6 “Using the Setup Utility program” on page 55.

To close the computer cover and reconnect cables to your computer, do the following:
1. Ensure that all components have been reassembled correctly and that no tools or loose screws are left
inside your computer. See “Locating major FRUs and CRUs” on page 74 for the locations of various
components in your computer.
2. If you have removed the front bezel, reinstall it. To reinstall the front bezel, align the three tabs on
the front bezel with the corresponding holes in the chassis and pivot the front bezel inwards until
it snaps into position.
3. Ensure that the cables are routed correctly. Keep cables clear of the hinges and sides of the computer
chassis to avoid interference with closing the computer cover.
4. Lower the optical drive bay.
5. Close the computer cover.
6. If there is an integrated cable lock available, lock the computer.
7. Reconnect the external cables and power cords to the computer. See “Locating connectors on the
rear of your computer” on page 74.

Chapter 10. Replacing FRUs (machine types: 2113, 2114, 2115, 3515, 4860, 4863, 4865, 4866,
4869, 5100, 10BS, 10BT, and 10BU) 187
 8. To update your configuration, see Chapter 6 “Using the Setup Utility program” on page 55.

Note: In most areas of the world, Lenovo requires the return of the defective Customer Replaceable Unit
(CRU). Information about this will come with the CRU or will come a few days after the CRU arrives.

Obtaining device drivers

You can obtain device drivers for operating systems that are not preinstalled at
http://www.lenovo.com/support. Installation instructions are provided in readme files with the device-driver
files.

188 ThinkCentre M78 Hardware Maintenance Manual

Chapter 11. Additional service information
This chapter provides additional information that the service representative might find helpful.

Security features
Security features in this section include the following:
• Passwords
• Vital Product Data

Hardware-controlled passwords
Use the Setup Utility program to set the hardware controlled passwords. For more information about
passwords, see “Using passwords” on page 55.

Operating system password

Note: This section applies only to computer models that have an operating system preinstalled from Lenovo.

An operating system password is very similar to a power-on password and denies access to the computer by
an unauthorized user when the password is activated. The computer is unusable until the correct password
is entered and recognized by the computer.

Vital Product Data

Each computer has a unique Vital Product Data (VPD) code stored in the nonvolatile memory on the system
board. After you replace the system board, the VPD must be updated. To update the VPD, see “Flash
update procedures” on page 189.

BIOS levels
An incorrect level of BIOS can cause false errors and unnecessary FRU replacement. Use the following
information to determine the current level of BIOS installed in the computer, the latest BIOS available for the
computer, and where to obtain the latest level of BIOS.
• To determine the current Level of BIOS:
– Start the Setup Utility.
– Select Standard CMOS Features.
• Sources for obtaining the latest level BIOS available
1. Lenovo support web site: http://www.lenovo.com/support/
2. Lenovo Customer Support Center
3. Levels 1 and 2 Support

To update (flash) the BIOS, see “Flash update procedures” on page 189.

Note: BIOS settings vary by operating system. Change the BIOS settings before installing a new operating
system. See “Changing the BIOS settings before installing a new operating system” on page 60.

Flash update procedures

This section details how to flash (update) the BIOS.

© Copyright Lenovo 2012, 2014 189

Flash update procedures
This section details how to flash (update) the BIOS.

Updating (flashing) the BIOS from your operating system

Note: Because Lenovo makes constant improvements to its Web sites, the Web page contents are subject
to change without notice, including the contents referenced in the following procedure.

To update (flash) the BIOS from your operating system, do the following:
1. Go to http://www.lenovo.com/support.
2. Click Download Drivers & Software.
3. Click Use Quick Path.
4. Type the 4-digit machine type for your computer in the Quick Path field and then click Find My Product.
5. Click BIOS.
6. Locate the BIOS version that you want to download.
7. Click Click for files. All available files will be displayed.
8. Click the link for the readme file that contains the instructions for updating (flashing) the BIOS from
your operating system.
9. Print these instructions. This is very important because these instructions will not be displayed on
the screen after the download begins.
10. Follow the printed instructions to download, extract, and install the update.

Recovering from a POST/BIOS update failure

If the power to your computer is interrupted while the POST and BIOS is being updated, your computer
might not restart correctly. If this happens, perform the following procedure to recover from the POST and
BIOS update failure. This procedure is commonly called Boot-block Recovery.
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover.
3. Locate the Clear CMOS /Recovery jumper on the system board. See “Locating parts on the system
board” on page 71.
4. Remove any cables that impede access to the Clear CMOS /Recovery jumper.
5. Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and
pin 3).
6. Reconnect any cables that were disconnected and reinstall the PCI card if removed.
7. Reinstall the computer cover and reconnect the power cords for the computer and monitor to electrical
outlets.
8. Turn on the computer and then insert the POST and BIOS update (flash update) disc into the optical
drive. Wait a few minutes. Then, the recovery session begins. The recovery session will take two to
three minutes. During this time, a warning message will be displayed and no action is needed from you.
9. After the recovery session is completed, there will be no video, and your computer will automatically
turn off.
10. Repeat step 1 through step 4.
11. Move the Clear CMOS /Recovery jumper back to the standard position (pin 1 and pin 2).
12. Reconnect any cables that were disconnected and reinstall the PCI card if removed.
13. Reinstall the computer cover and reconnect any cables that were disconnected.
14. Turn on the computer to restart the operating system.

190 ThinkCentre M78 Hardware Maintenance Manual

Power management
Power management reduces the power consumption of certain components of the computer such as the
system power supply, processor, hard disk drives, and some monitors.

Advanced Configuration and Power Interface (ACPI) BIOS

Being an ACPI BIOS system, the operating system is allowed to control the power management features
of the computer and the setting for Advanced Power Management (APM) BIOS mode is ignored. Not
all operating systems support ACPI BIOS mode.

Automatic Power-on features

The Automatic Power-On features within the Power Management menu allow you to enable and disable
features that turn on the computer automatically.
• Wake Up on Alarm: You can specify a date and time at which the computer will be turned on
automatically. This can be either a single event or a daily event.
• Wake on LAN: If the computer has a properly configured token-ring or Ethernet LAN adapter card that is
Wake on LAN-enabled and there is remote network management software, you can use the Wake on LAN
feature. When you set Wake on LAN to Enabled, the computer will turn on when it receives a specific
signal from another computer on the local area network (LAN).

To enable the Wake on LAN function or the Wake Up on Alarm function on the Windows 8 operating system,
do the following:
1. Open Control Panel.
2. Click Hardware and Sound ➙ Power Options.
3. In the left panel, click Choose what the power buttons do.
4. In the Shutdown setting section, clear Turn on fast startup.

Note: If the settings are unavailable, click Change settings that are currently unavailable.
5. Click Save changes.

Chapter 11. Additional service information 191

192 ThinkCentre M78 Hardware Maintenance Manual
Appendix A. Notices
Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult
your local Lenovo representative for information on the products and services currently available in your
area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that
Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service
that does not infringe any Lenovo intellectual property right may be used instead. However, it is the user's
responsibility to evaluate and verify the operation of any other product, program, or service.

Lenovo may have patents or pending patent applications covering subject matter described in this
document. The furnishing of this document does not give you any license to these patents. You can send
license inquiries, in writing, to:
Lenovo (United States), Inc.
1009 Think Place - Building One
Morrisville, NC 27560
U.S.A.
Attention: Lenovo Director of Licensing

LENOVO PROVIDES THIS PUBLICATION “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do not allow
disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply
to you.

This information could include technical inaccuracies or typographical errors. Changes are periodically
made to the information herein; these changes will be incorporated in new editions of the publication.
Lenovo may make improvements and/or changes in the product(s) and/or the program(s) described in this
publication at any time without notice.

The products described in this document are not intended for use in implantation or other life support
applications where malfunction may result in injury or death to persons. The information contained in this
document does not affect or change Lenovo product specifications or warranties. Nothing in this document
shall operate as an express or implied license or indemnity under the intellectual property rights of Lenovo
or third parties. All information contained in this document was obtained in specific environments and is
presented as an illustration. The result obtained in other operating environments may vary.

Lenovo may use or distribute any of the information you supply in any way it believes appropriate without
incurring any obligation to you.

Any references in this publication to non-Lenovo Web sites are provided for convenience only and do not in
any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of
the materials for this Lenovo product, and use of those Web sites is at your own risk.

Any performance data contained herein was determined in a controlled environment. Therefore, the result
obtained in other operating environments may vary significantly. Some measurements may have been
made on development-level systems and there is no guarantee that these measurements will be the same
on generally available systems. Furthermore, some measurements may have been estimated through
extrapolation. Actual results may vary. Users of this document should verify the applicable data for their
specific environment.

© Copyright Lenovo 2012, 2014 193

Television output notice
The following notice applies to models that have the factory-installed television-output feature.

This product incorporates copyright protection technology that is protected by method claims of certain U.S.
patents and other intellectual property rights owned by Macrovision Corporation and other rights owners.
Use of this copyright protection technology must be authorized by Macrovision Corporation, and is intended
for home and other limited viewing uses only unless otherwise authorized by Macrovision Corporation.
Reverse engineering or disassembly is prohibited.

European conformance CE mark

Trademarks
The following terms are trademarks of Lenovo in the United States, other countries, or both:
Lenovo
The Lenovo logo
Rescue and Recovery
ThinkCentre
ThinkVantage

Microsoft and Windows are trademarks of the Microsoft group of companies.

DisplayPort is a Trademark of the Video Electronics Standards Association.

Other company, product, or service names may be trademarks or service marks of others.

194 ThinkCentre M78 Hardware Maintenance Manual

Index
A F
accessing failure, recovering from POST/BIOS 190
system board components and drives 138 front
Administrator, password 56 connectors, controls, indicators 67, 73
front audio and USB assembly, replacing 115, 176
front bezel
B front bezel, removing 81
removing, reinstalling 136
basic troubleshooting 35
front bezel, reinstalling 81
battery, replacing 97, 150
front fan assembly, replacing 111
BIOS settings, changing 60
front WiFi antenna, installing, removing 129, 184
boot-block recovery 190
FRU locations 68, 74
FRU part numbers 1, 67, 70, 76, 79, 135

C
cables, connecting 187 H
card reader, installing 89, 143 hard disk drive, replacing 105, 151
card reader, replacing 92 heat sink and fan assembly
changing replacing 158
password 56 heat sink and fan assembly, replacing 100
startup device sequence 58
CMOS, clearing 57
components, internal 68, 74 I
computer cover Identifying FRUs 68, 74
opening 136 installing
removing 80 operating system 60
computer cover, reinstalling 132 solid state drive 110, 154
connectors installing options
rear 68, 74 memory module 85, 139
connectors, controls, indicators PCI card 82, 141
front 67, 73 internal speaker, replacing 116, 172
considerations, passwords 56
cover presence switch, replacing 120, 170
CRU K
completing the installation 132, 187
keyboard, replacing 131, 187
CRUs (Customer Replaceable Units), returning
defective 68, 74
L
D Lenovo Solution Center 53
locating components 68, 74
deleting a password 56 looking up part numbers 1, 67, 70, 76, 79, 135
device drivers 133, 188
devices, handling static-sensitive 79, 135
diagnostics, troubleshooting 35 M
drivers, device 133, 188 memory module
drives installing, replacing 85, 139
bays 72, 78 system board 85, 139
specifications 72, 78 microprocessor
replacing 102, 166
mouse, replacing 131, 187
E
environment, operating 29–30
exiting, Setup Utility 60
O
external options, installing 79, 135 opening computer cover 136

© Copyright Lenovo 2012, 2014 195

optical drive, installing or replacing 156 changing 55
optical drive, replacing 87 viewing 55
Optional-service CRUs 68, 74 Setup Utility 55
Setup Utility program, starting 55
Setup Utility, exiting 60
P solid state drive, installing 110, 154
starting the Setup Utility program 55
part numbers 1, 67, 70, 76, 79, 135
startup device 58
parts replacement, completing 132, 187
sequence, changing 58
password
temporary, selecting 58
Administrator 56
static-sensitive devices, handling 79, 135
considerations 56
support web site
Power-On Password 56
support 32
setting, changing, deleting 56
support, web site 32
passwords
system board
erasing 57
connectors 71, 77
lost or forgotten 57
locating parts 71, 77
passwords, using 55
locations 71, 77
PCI card 82, 141
memory module 85, 139
installing, replacing 82, 141
replacing 104
slots 82
system board components and drives
physical specifications 29–30
accessing 138
power supply assembly
replacing 161
power supply assembly, replacing 98
power switch unit, replacing 93, 148
T
Power-On, Password 56 temporary startup device 58
the BIOS, updating (flashing) 190
thermal sensor, replacing 118, 174
R troubleshooting, basic 35
troubleshooting, diagnostics 35
rear connectors 68, 74
rear fan assembly, replacing 113
rear WiFi antenna, installing, removing 128, 182
recovering U
from a POST/BIOS update failure 190 updating (flashing) the BIOS 190
recovery using
boot-block 190 passwords 55
removing computer cover 80 Setup Utility 55
removing, reinstalling
front bezel 136
replacing V
battery 97, 150
card reader 92 viewing and changing settings 55
hard disk drive 105, 151
heat sink and fan assembly 100, 158
microprocessor 102, 166 W
power supply assembly 161 WiFi units, WiFi adapter card, WiFi card module, WiFi
system board 104 antenna cable, replacing 122, 178

S
security
enabling or disabling 57
selecting
startup device 58
temporary startup device 58
Self-service CRUs 68, 74
setting
password 56
settings

196 ThinkCentre M78 Hardware Maintenance Manual