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Feb 2, 2013 3:02 AM in response to poikasupportby Klaus1,Try resetting the SMU:
Resetting the SMU on a G5 iMac:
http://support.apple.com/kb/HT1767
and on resetting the PMU on a Power Mac G5, G4 and G3 :
http://support.apple.com/kb/HT1939?viewlocale=en_US
and also this:
Resetting your Mac's PRAM and NVRAM:
http://support.apple.com/kb/ht1379
Then restart your Mac. Any better?