IBM ThinkPad i Series 1800 Troubleshooting Manual page 20

Solving computer problems
Message
0220: Monitor type error
0230: Shadow RAM error The shadow RAM failed. Test your computer's memory with PC-Doctor. If
0231: System RAM error
0232: Extended RAM
error
0250: System battery
error
0251: System CMOS
checksum bad
0252: Password
checksum bad
0260: System timer error
0270: Real time clock
error
0271: Date and time error Neither the date nor the time is set in the computer. Set the date and time,
0280: Previous boot
incomplete
02D0: System cache error The cache is disabled. Have the computer serviced.
02F4: EISA CMOS not
writable
02F5: DMA test failed
02F6: Software NMI
failed
02F7: Fail-safe timer NMI
failed
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ThinkPad A21e Service and Troubleshooting Guide
Cause and action
The monitor type does not match the type specified in CMOS. Run the IBM
BIOS Setup Utility to make sure that your monitor type matches the type
specified in the utility.
you added a memory module just before turning the computer on, reinstall
it. Then test the memory with PC-Doctor.
The system RAM failed. Test your computer's memory with PC-Doctor. If
you added a memory module just before turning the computer on, reinstall
it. Then test the memory with PC-Doctor.
The extended RAM failed. Test your computer's memory with PC-Doctor. If
you increased memory just before turning the computer on, reinstall it. Then
test the memory with PC-Doctor.
The system battery is dead. Replace the battery and run the IBM BIOS Setup
Utility to verify the configuration. If you still have a problem, have the
computer serviced.
The system CMOS may have been corrupted by an application program.
The computer uses the default settings. Run the BIOS Setup Utility to
reconfigure the settings. If you still see the same error code, have the
computer serviced.
The password you have set has been cleared. Run the BIOS Setup Utility to
set the password.
Have the computer serviced.
Have the computer serviced.
using the IBM BIOS Setup Utility.
Your computer was previously unable to complete the boot process. Turn
the computer off; then turn it on to start the IBM 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.
Have the computer serviced.
Have the computer serviced.
Have the computer serviced.
Have the computer serviced.