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CMOS battery low
Explanation: The CMOS memory holds the BIOS settings is powered using a battery so that the settings are not lost when the PC is turned off. Some motherboards can detect when the battery is getting weak (though many do not). The system is giving you a warning that the battery is getting low on power.
Diagnosis: The battery is running low. It is unusual for this to be caused by anything else.
Recommendation: Follow these directions to deal with the failing battery. You should still be able to use the system without any problems for a while.