CMOS Checksum Error

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CMOS Checksum Error

You power up your computer and the screen displays the following error message:

  • CMOS checksum Error: Defaults loaded


Possible Causes

A checksum error shows that boot up settings which were previously set have been changed. This usually happens when the battery looses its charge and thus fail to retain the CMOS settings. This can also be caused by a power surge and a damaged motherboard.


  1. Reboot the computer
  2. If the error persist, replace the CMOS battery
  3. Enter the values back into CMOS or reset values to default

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