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POST error codes, Power-On Self-Test

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Beep Symptom 1 long and 2 short beeps Monitor or video adapter card error 1 long and 3 short beeps Keyboard error 1 long and 9 short beeps BIOS ROM error Continuous long beep DRAM memory error FRU/Action Perform the following actions in order. 1. Make sure the monitor is properly connected to the computer. 2. Replace the video adapter card (if present). 3. Replace the system board. Perform the following actions in order. 1. Make sure the keyboard is properly connected to the keyboard connector. 2. Replace the keyboard. 3. Replace the system board. Perform the following actions in order. 1. Start the Setup Utility program and press F7 to load defaults and then press F10 to Save and exit. See Chapter 6 "Diagnostics, Test and Recovery Information" on page 39. 2. Perform a Boot block recovery. See "Updating (flashing) BIOS from your operating system" on page 522. 3. Replace the system board. Perform the following actions in order. 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 Message CMOS battery failed Description/Action The CMOS battery is no longer functional. CMOS checksum error - defaults loaded Replace the battery. Checksum of CMOS is incorrect. The computer loads the default configuration settings. This error might indicate that CMOS has become corrupt due to a weak CMOS battery. 62 ThinkCentre Hardware Maintenance Manual

Section	Page
Chapter 1. About this manual	7
Important Safety Information	7
Important information about replacing RoHS compliant FRUs	7
Turkish statement of compliance	8
Chapter 2. Safety information	9
General safety	9
Electrical safety	9
Voltage-selection switch	11
Safety inspection guide	11
Handling electrostatic discharge-sensitive devices	12
Grounding requirements	12
Safety notices (multi-lingual translations)	12
Chapter 3. General information	35
The ThinkVantage Productivity Center program	35
Additional information resources	35
Specifications	35
Types 7258, 7260, 7268, 7270, 7280, 7296, 7298, 7304, 7307,7413, 7491, and 7508	36
Types 7259, 7267, 7269, 7279, 7297, 7303, 7306, 7487, 7506, and 7514	36
Chapter 4. General Checkout	39
Problem determination tips	39
Chapter 5. Diagnostics	41
Lenovo System Toolbox	41
PC-Doctor for Windows PE	41
Running diagnostics from the Rescue and Recovery workspace	41
PC-Doctor for DOS	42
Creating a diagnostic CD/DVD image	42
Running diagnostics from the disc	42
Navigating through the diagnostics programs	42
Running tests	42
Viewing the test log	44
Chapter 6. Using the Setup Utility	45
Starting the Setup Utility program	45
Viewing and changing settings	45
Using passwords	45
Password considerations	45
Power-On Password	46
Privileged Access Password	46
Setting, changing, and deleting a password	46
Enabling or disabling a device	46
Selecting a startup device	47
Selecting a temporary startup device	47
Selecting or changing the startup device sequence	47
Advanced settings	47
Exiting from the Setup Utility program	47
Chapter 7. Symptom-to-FRU Index	49
Hard disk drive boot error	49
Power Supply Problems	49
Diagnostic error codes	50
Beep symptoms	67
POST error codes	68
Miscellaneous error messages	69
Undetermined problems	71
Chapter 8. Replacing FRUs (Types 7258, 7260, 7268, 7270, 7280, 7296, 7298, 7304, 7307,7413, 7491, and 7508)	73
Locations	73
Rear connectors	73
Computer components	74
System board connectors	74
Removing the computer cover	75
Removing and installing the front bezel	76
Replacing the power supply assembly	77
Replacing the system board	78
Replacing the heat sink and fan assembly	80
Replacing the microprocessor	81
Replacing a memory module	85
Installing or replacing an adapter card	86
Replacing the primary hard disk drive	88
Replacing the secondary hard disk drive	91
Replacing an optical drive	94
Replacing the diskette drive or card reader	94
Replacing the front fan assembly	96
Replacing the rear fan assembly	97
Replacing the front audio/USB assembly	99
Replacing the power switch/LED assembly	99
Replacing the CMOS battery	100
Replacing the Internal speaker	101
Completing the FRU replacement	101
Chapter 9. Replacing FRUs (Types 7259, 7267, 7269, 7279, 7290, 7297, 7303, 7306, 7408, 7487, 7506 and 7514)	103
Locations	103
Rear connectors	103
Computer components	104
System board connectors	104
Opening the cover	105
Accessing system board components and drives	106
Replacing a memory module	106
Replacing the battery	107
Replacing the power supply	108
Replacing the system board	110
Replacing the microprocessor	113
Replacing the heat sink and fan assembly	115
Replacing the hard disk drive	116
Replacing the optical drive	118
Replacing the internal speaker	120
Replacing the power switch/LED assembly	121
Replacing the card reader	122
Installing or replacing an adapter card	122
Completing the FRU replacement	124
Chapter 10. FRU lists	127
Overall: MT 7258, 7260, 7268, 7270, 7280, 7296, 7298, 7304, 7307,7413, 7491, and 7508	127
Mechanical FRUs	153
Keyboard and Mouse	164
Adapters and miscellaneous FRUs	207
Power Cords	215
Recovery discs	227
Overall: MT 7259, 7267, 7269, 7279, 7297, 7303, 7306, 7487, 7506, and 7514	323
Mechanical FRUs	353
Keyboard and Mouse	365
Adapters and miscellaneous FRUs	407
Power Cords	416
Recovery discs	428
Chapter 11. Additional Service Information	527
Security features	527
Hardware controlled Passwords	527
Operating system password	527
Vital product data	527
BIOS levels	527
Flash update procedures	527
Updating (flashing) BIOS from a disc	528
Updating (flashing) BIOS from your operating system	528
Recovering from a POST/BIOS update failure	528
Power management	529
Automatic configuration and power interface (ACPI) BIOS	529
Automatic Power-On features	529
Appendix A. Notices	531
Television output notice	532
Trademarks	532

Match case Limit results 1 per page

Beep Symptom

FRU/Action

1 long and 2 short beeps

Monitor or video adapter card

error

Perform the following actions in order.

1. Make sure the monitor is properly connected to the

computer.

2. Replace the video adapter card (if present).

3. Replace the system board.

1 long and 3 short beeps

Keyboard error

Perform the following actions in order.

1. Make sure the keyboard is properly connected to the

keyboard connector.

2. Replace the keyboard.

3. Replace the system board.

1 long and 9 short beeps

BIOS ROM error

Perform the following actions in order.

1. Start the Setup Utility program and press F7 to

load defaults and then press F10 to Save and exit.

See Chapter 6 “Diagnostics, Test and Recovery

Information” on page 39.

2. Perform a Boot block recovery. See “Updating

(ﬂashing) BIOS from your operating system” on page

522.

3. Replace the system board.

Continuous long beep

DRAM memory error

Perform the following actions in order.

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 Message

Description/Action

CMOS battery failed

The CMOS battery is no longer functional.

Replace the battery.

CMOS checksum error - defaults loaded

Checksum of CMOS is incorrect.

The computer loads the default conﬁguration settings.

This error might indicate that CMOS has become corrupt

due to a weak CMOS battery.

ThinkCentre Hardware Maintenance Manual