Hai


Possibly heat related?
As much as I liked the G5 series macs, the Imac G5's were always problematic when I worked at Apple. They were always coming in for issues related to them shutting down on their own, and never turning on again. Cramming that G5 cpu in such a tight space was not such a great idea.

Anyway, taking the motherboard out and giving it a good cleaning helps alot, the mixed use of copper and aluminum seems to cause alot of corrosion around the CPU, especially on the heatsink, it starts to grow green stuff after a year or so in service. Not good. I have one now I'm working on if you would like some pictures of this. The machine cuts off randomly and sometimes will not boot up at all and the light will glow bright. Other times it will boot and the start up sound is all crackly. Fun times.

Still prefer the G5's and PowerPC's in general to intel crap macs.

Have just found this: http://www.macfixit.com/article.php?story=20080509075721395 Hope it helps.