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[ The PC Guide | Troubleshooting and Repair Guide | The Troubleshooting Expert | Troubleshooting The System Overall | Troubleshooting Boot-Time Error Messages ]

CMOS battery failure

Explanation: The CMOS memory holds the BIOS settings that you define in the BIOS setup program. This memory is powered using a battery so that the settings are not lose when you turn off the power 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: Troubleshoot the battery.

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