When i turn my cpu on , it says "system battery voltage low hit f1 to continue or f2 for setup" what's up?

i turned my cpu off for the weekend while i was out of town and that is the message i got when i turned it back on . it will not let me go any further . i hit the f1 and f2 keys , but it doesn't do anything. this has happened before, but i have always been able to get it to come back on. no luck this time, so... show more i turned my cpu off for the weekend while i was out of town and that is the message i got when i turned it back on . it will not let me go any further . i hit the f1 and f2 keys , but it doesn't do anything. this has happened before, but i have always been able to get it to come back on. no luck this time, so i am having to use my sons cpu . please help.
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