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Solution: The EEPROM checksum is not correct (block # 4 and 5). Reset the block # 0 and 1, for example
the box Serial Number, and/or block # 4 and 5, for example the UUID.
• Message: 0190: Critical low-battery error.
Solution: The computer turns off, because the battery is low. Connect the ac power adapter to the
computer and charge the battery.
• Message: 0191: System Security - Invalid remote change requested.
Solution: Bad system conguration change request has been detected, for example, the BootBlock
update has failed or unknown request packet has been detected. To clear the error, enter the ThinkPad
Setup program.
• Message: 0199: System Security - Security password retry count exceeded.
Solution: This message is displayed if you enter a wrong supervisor password more than three times.
Conrm the supervisor password and try again. To clear the error, enter the ThinkPad Setup program.
• Message: 1802: Unauthorized network card is plugged in - Power off and remove the network card.
Solution: The wireless network card is not supported on this computer. Remove it.
• 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: 0271: Real Time Clock Error - Check Date and Time settings.
Solution: Neither the date nor the time is set in the computer. Enter ThinkPad Setup to set the date and
time.
• Message: 2000: ThinkVantage Active Protection sensor diagnostics failed.
Solution: ThinkVantage
®
Active Protection sensor is not working correctly. Have the computer serviced.
• Message: 2100: Detection error on HDD0 (Main HDD).
Solution: The hard disk drive is not working. Have the hard disk drive serviced.
• Message: 2102: Detection error on HDD2 (M.2 SATA)
Solution: The M.2 SATA device is not working. Have the M.2 SATA device serviced.
• Message: 2110: Read error on HDD0 (Main HDD)
Solution: The main hard disk drive is not working. Have the main hard disk drive serviced.
• Message: 2112: Read error on HDD2 (M.2 SATA)
Solution: The M.2 SATA device is not working. Have the M.2 SATA device serviced.
• Message: 2200: Machine Type and Serial Number are invalid.
Solution: Machine Type and Serial Number are invalid. Have the computer serviced.
• Message: 2201: Machine UUID is invalid.
Solution: Machine UUID is invalid. Have the computer serviced.
• Message: Fan error
Chapter 9. Troubleshooting computer problems 83