A. You have to replace the bios battery. This is kind of a pain on a laptop. You have to open it up and find the coin battery on the motherboard. B. You have to get the password from the person who originally set it.
SOURCE: bios password ibm thinkpad g40
Sounds like you tried this, but it's worth a shot again. Remove the CMOS battery on the motherboard and let the laptop sit for an hour, then replace the battery with a new one.
If the only real issue is changing the time and date, you can do this in Windows and it will reset the BIOS clock, too, of course.
If the problem is that the time and date keep reseting, you either have a low CMOS battery or a short on the motherboard that is resetting it.
If all else fails, you might need to flash the BIOS from a floppy disk with the latest BIOS version for your machine to reset it and go from there.
PS: BIOS reset problems on laptops are sometimes due to power problems caused by battery packs going bad; check your battery pack, too, and see if it is working okay.
Good luck...
SOURCE: Error 0271 check the date and time setting
The BIOS battery is flat and cannot keep the corrected date and time. Replace the BIOS battery anf then go into the BIOS configuration to set the time and date.
SOURCE: Removing CMOS battery on ibm r50e is not solving the pass problem
Removing battery or resetting BIOS with jumper will not help. You should call IBM for support on this issue. All thinkpads have a three year warranty, with either return to base or on-site service. Since the R50e is a recent model, you should have no problem getting it serviced directly by IBM. Toll Free: 1-800-IBM-SERV (1-800-426-7378)
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.
SOURCE: THINKPAD R40 TYPE 2682
search the internet, most BIOS manufacturers leave a back door for problems like this.
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