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: When I am trying to boot up my Laptop
you can fix that problem with your own. press f2 and then correct the time and date, then press f10. I f you got same problem again change the cmos battery then do it again.
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