Ursprünglicher Beitrag von: Chris Green ,
It sounds like the computer is overheating (Or even worse, thinking it is overheating) Check that the system fans are all working, and maybe remove the CPU heatsinks, and clean them out. Also, replace the thermal compound on the processors if you can. Powermac G5s would act up if one of their processors died, but still show some signs of function. If CPUA works, but CPUB is damaged, you may be able to boot the computer with only CPUA installed. (I would only try this after ruling out any other problems) Unfortionatly, I'm not incredibly familiar with these machines. The RAM wouldn't all die at once, so that probably isn't your problem.