IBM THINKPAD T60 - SERVICE AND Service And Troubleshooting Manual page 21

Message
0251: System CMOS
checksum bad
0271: Date and time
error
0280: Previous boot
incomplete
1802: Unauthorized
network card is
plugged in - Power
off and remove the
miniPCI network
card.
1803: Unauthorized
daughter card is
plugged in - Power
off and remove the
daughter card.
Solution
The system CMOS might have been corrupted by an
application program. The computer uses the default settings.
Run BIOS Setup Utility to reconfigure the settings. If you still
see the same error code, have the computer serviced.
Neither the date nor the time is set in the computer. Set the
date and time, using the BIOS Setup Utility.
Your computer was previously unable to complete the boot
process.
Turn the computer off; then turn it on to start the BIOS Setup
Utility. Verify the configuration and then restart the computer
either by choosing the Exit Saving Changes option under the
Restart item or by pressing F10. If you still see the same error
code, have the computer serviced.
The Mini-PCI network card is not supported on this computer.
Remove it.
The daughter card is not supported on this computer. Remove
it.
Solving computer problems
Chapter 3. Solving computer problems
13