Lenovo ThinkCentre M72e, Hardware Maintenance Manual

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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 35. 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
configuration. Check the configuration and ensure the start-up drive is
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:
• Power cord
• On/Off switch connector
• On/Off switch power supply connector
• System board power supply connectors
• Microprocessor(s) connection
Reseat connectors
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.
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