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Jan 26, 2013 2:29 AM in response to WellsofLifeMusicby edex67,The Quad series are notoriously unreliable. If you open the G5 can you see signs of coolant leakage?
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Jan 26, 2013 9:21 AM in response to WellsofLifeMusicby Texas Mac Man,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
If you can boot using your system disc, run Disk Utility on the Hard Drive.
On the disc(s) that came wit you G5, there shouls be a version of the Apple Hardware Test. Run it.
Cheers, Tom