0251: System CMOS checksum bad

Note: Always power-cycle your system when you receive this message. If the system repeats the error message, follow the corrective action for the error message.
Message
0251: System CMOS checksum bad–Default configuration used
Description
CMOS checksum is bad, possibly because the system was reset during BIOS boot or because of a dead RTC battery.
Corrective action
  1. Reboot the system.
  2. If the problem persists, replace the RTC battery.
  3. Reset the RTC.