IBM manual ThinkPad X20, X21, X22, X23, X24

0200	1. Reseat the hard disk
Fixed disk failure		drive.
	2. Load Setup Defaults in IBM
		BIOS Setup Utility.
	3.	Hard disk drive.
	4.	System board.
021x	1. Load Setup Defaults in
Monitor type does not match		IBM BIOS Setup Utility.
CMOS
0220	1.	System board.
Shadow RAM failure at offset
nnnn
0232	1.	DIMM.
Extended RAM failure at offset	2.	System board.
nnnn
0250	1.	Replace the backup
System battery is dead—		battery and run IBM BIOS
		Setup Utility to reset the
replace and run setup
		time and date.
0251	1.	Replace the backup
System CMOS checksum		battery and run IBM BIOS
		Setup Utility to reset the
bad—Default configuration used
		time and date..
0252	1. Reset the password by
Password checksum bad.		running IBM BIOS Setup
		Utility.
0260	1.	Replace the backup
System timer error		battery and run IBM BIOS
		Setup Utility to reset the
		time and date.
	2.	System board.
0270	1.	Replace the backup
Real time clock error		battery and run IBM BIOS
		Setup Utility to reset the
		time and date.
	2.	System board.
0271	1. Run IBM BIOS Setup
Date and time error		Utility to reset the time
		and date..
0280	1. Load Setup Defaults in
Boot incomplete error— Default		IBM BIOS Setup Utility.
	2.	DIMM.
configuration used
	3.	System board.

Chapter 3. ThinkPad X20, X21, X22, X23, X24 49