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Helpful answers
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May 28, 2013 1:44 AM in response to bfg2010by Klaus1,A PMU reset can often cure that:
Resetting the PMU on a Power Mac G5, G4 and G3 :
http://support.apple.com/kb/HT1939?viewlocale=en_US
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May 28, 2013 7:27 AM in response to bfg2010by Allan Jones,If you look in the headphone jack with teh computer is on, do you see a red glow?