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.
Sounds like a bad CMOS backup battery. If you look on the mother board there should be a small black chip (label BIOS usually) with a watch battery next to it. Replace it.
I personally recommend consulting IBM though if you're not very literate with computers.
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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aerfeferee
Finally figured it out - the CMOS battery was dead although I would never have guessed it from IBM/Lenovo's message!
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