Andrew has a personal computer. One morning, he starts his computer and finds the following error
message: “CMOS checksum failure.”What are the most likely causes of this error? Each correct
Answer represents a complete solution. Choose two.

A.
BIOS has become outdated.

B.
The CMOS battery has failed.

C.
The CMOS chip has failed.

D.
Software stored in the CMOS battery is infected by a virus.

Explanation:

This error message is displayed when the BIOS detects a memory problem in the CMOS. The
following are the most likely causes of the error:
The CMOS battery has failed.
The CMOS chip has failed.
In order to rectify the error, a technician should try to replace the CMOS battery. If this step does
not work, it may indicate that the CMOS chip is bad.
Answer option A is incorrect. An outdated BIOS will not display this error. The outdated BIOS may
create problems with new hardware added to the computer. Answer option D is incorrect. The
CMOS battery does not contain any software and cannot be infected by viruses.