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• Message: 0251: System CMOS checksum bad.
Solution: The system CMOS might have been corrupted by an application program. The computer uses
the default settings. Run ThinkPad Setup to recongure the settings. If you still see the same error code,
have the computer serviced.
• Message: 0260: System timer error.
Solution: Have the computer serviced.
• 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 ThinkPad
Setup.
• Message: 0280: Previous boot incomplete.
Solution: Your computer was unable to complete the boot process.
Turn the computer off; then turn it on to start ThinkPad Setup. Verify the conguration 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.
• 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: 1802: Unauthorized network card is plugged in - Power off and remove the network card.
Solution: The mini PCI Express network card is not supported on this computer. Remove it.
• Message: 1803: Unauthorized daughter card is plugged in - Power off and remove the daughter card.
Solution: The daughter card is not supported on this computer. Remove it.
• Message: 1805: Unauthorized Wireless USB card is plugged in - Power off and remove the Wireless
USB card.
Solution: The Wireless USB card is not supported on this computer. Remove it.
• Message: 2100: Initialization error on HDD0 (Main HDD).
Solution: The hard disk drive is not working. Have the hard disk drive serviced.
Chapter 9. Troubleshooting computer problems 117