Lenovo 4222, 4220, 4215 Symptom-to-FRU Index, Hard disk drive boot error, Power Supply Problems

Chapter 8. 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 31. 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 67.

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 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 system programs, 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

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