IBM ThinkPad X22 Service & Troubleshooting Manual page 27

Message: 0270: Real time clock error
Solution: Have the computer serviced.
Message: 0271: Date and time error
Solution: Neither the date nor the time is set in the computer. Set the date
and time, using the IBM BIOS Setup Utility.
Message: 0280: Previous boot incomplete
Solution: Your computer was previously unable to complete the boot process.
Power the computer off; then power it on to start the BIOS Setup Utility.
Verify the configuration and then restart the computer by using the Exit
Saving Changes option under the Restart item or by pressing F10
If there is still a problem, have the computer serviced.
Message: 02D0: System cache error
Solution: The cache is disabled. Have the computer serviced.
Message: 02F4: EISA CMOS not writable
Solution: Have the computer serviced.
Message: 02F5: DMA test failed
Solution: Have the computer serviced.
Message: 02F6: Software NMI failed
Solution: Have the computer serviced.
Message: 02F7: Fail-safe timer NMI failed
Solution: Have the computer serviced.
Message: The power-on password prompt
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Chapter 2. Solving computer problems