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Solution: The extended RAM failed. Test your computer's memory with “Lenovo ThinkVantage Toolbox”
on page 131. If you have increased memory just before turning the computer on, reinstall it. Then test
the memory with Lenovo ThinkVantage Toolbox.
• Message: 0250: System battery error.
Solution: The backup battery, which is used to preserve the conguration information, such as the date
and time, while the computer is tuned off, is depleted. Replace the battery and run ThinkPad Setup to
verify the conguration. If you still have a problem, have the computer serviced.
• 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 the ThinkPad
Setup.
• Message: 0280: Previous boot incomplete.
Solution: Your computer was previously unable to complete the boot process.
Turn the computer off; then turn it on to start the 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.
Chapter 10. Troubleshooting computer problems 135