Lenovo ThinkCentre 0401, Hardware Maintenance Manual, Page: 45 / 170

Chapter 4. General Checkout
Attention
The drives in the computer you are servicing might have been rearranged or
the drive startup sequence 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 an explanation of these messages, refer
to the information supplied with that software package.
Before replacing any FRUs, 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 157.
Use the following procedure to help determine the cause of the 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.
v
Look for displayed error codes
v
Listen for beep codes
v
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:
v
If you hear beep codes during POST, go to “Beep symptoms” on page 71.
v
If the computer displays a POST error, go to “POST error codes” on page 72.
v
If the computer hangs and no error is displayed, continue at step 7.
7. Run the Diagnostic programs. See Chapter 5, “Diagnostics,” on page 41.
v If you receive an error, replace the part that the diagnostic program calls out
or go to “Diagnostic error codes” on page 50.
v
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.
v Machine type and model
v
Processor or hard disk drive upgrades
v Failure symptom
– Do diagnostics indicate a failure?
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