I have a B&W with a G3/800 upgrade card. My problem is anytime I accidently hit the tower with my foot or chair or anything else, it locks the computer up (cursor freezes). Then pressing the reset switch will often not reboot it (no chime). I have to do this several times, sometimes through trial and error, I've found that opening the case and booting it with the door open seems to work, but then half the time when I close it ever so gently, it locks up again, and the whole process starts all over.
Sounds like a definite hardware problem, but any suggestions? And buying a new G5 is not an option right now.
Thanks,
Kevin