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Helpful answers
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Nov 22, 2012 8:55 AM in response to Sam Schlegelby Texas Mac Man,When was the last time you used it and has it remained plugged into AC power?
First try a PMU reset See How to reset the SMU/PMU on a Power Mac Earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
Your internal PRAM battery may be weak or discharged. Suggest you replace the battery. Check this site for battery part numbers and sources. https://sites.google.com/site/macpram/mac-pram-nvram-cuda-pmu-battery-tutorial Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
Cheers, Tom