CMOS mismatch

CMOS mismatch errors typically occur if the computer's power-on self-test program:^[1][2]

1. Finds a device that is not recorded in the CMOS.
2. Does not find a device that is recorded in the CMOS.
3. Finds a device that has different settings than those recorded for it in CMOS.
4. Detects a CMOS checksum error.