CMOS Battery Failure

CMOS Battery Failure

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Explanation: The CMOS memory holds the BIOS settings that you define in the BIOS setup program. This memory is powered using a small battery mounted on the motherboard so that the settings are not lost when you turn off the main power switch to the system. Many motherboards do not test the status of this battery and will just indicate problems with the CMOS memory when the battery fails, but some motherboards can detect when the battery is no longer functioning.

Diagnosis: The CMOS battery has probably failed, if the system was previously working; if it is a new system, this could be a motherboard problem.

Recommendation: Replace the battery.

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