On startup, you might see a BIOS or CMOS checksum error indicating that a Basic Input/Output System (BIOS) test has failed.
One of the following error messages is displayed:
The error that appears depends on the version of the BIOS.
BIOS ROM checksum error
System CMOS checksum bad - default configuration used
Press <F1> to resume, <F2> to Setup
CMOS Checksum Bad
Press F2 to Run SETUP
Press F1 to load default values and continue
CMOS Checksum Error - Default loaded
The are two main reasons a BIOS test fails:
The battery on the system board has lost its ability to supply power.
The BIOS was updated incorrectly.
Use the following steps to access the BIOS and apply the default settings to resolve the checksum error.