Lenovo 90BX E50-00 Series, Hardware Maintenance Manual

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Chapter 6. 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 Chapter 4, “General Checkout,” on page 11. This index can also be used to help you
decide which FRUs to have available when servicing a computer. If you are unable to correct the problem
using this index, go to “Undetermined problems” on page 20.
Notes:
• If you have both an error message and an incorrect audio response, diagnose the error message first.
• If you cannot run the diagnostic tests or you get a diagnostic error code when running a test but did
receive a POST error message, diagnose the POST error message first.
• 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 can have the following causes.
Error FRU/Action
The startup drive is not included in the boot sequence
in configuration.
Check the configuration and ensure the startup 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 startup 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. Use the operating system to format the hard disk
drive.
The drive is defective. Replace the hard disk drive.
Power Supply Problems
Follow these procedures if you suspect there is a power supply problem.
Check/Verify FRU/Action
Check that the following are properly installed:
• Power Cord
• On/Off Switch connector
• System Board Power Supply connectors
• Microprocessor(s) connection
Reseat connectors
Check the power cord. Power Cord
Check the power-on switch. Power-on Switch
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