SOURCE: T23 BIOS error code #05
are you getting a date & time error ?. you could always try just resetting the bios.... remove the bios battery AND the battery itself for about five minutes or so. install it all again and boot up.
Robert
SOURCE: IBM Thinkpad will not hold date & time.
Replace the backup battery and run BIOS Setup Utility to reset the time and date. This will resolve the issue.
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