I have a powermac G3 (beige) and it will not boot up. The screen is gray and the mac computer is happy. But after a minute the screen goes black and a bunch of junk is displayed on the screen. At the bottom of the screen it says memory access exception (1,0,0). Its says press c to continue and r to reboot. I press C and the screen says some more stuff and it says press c to continue or r to reboot I press c again and it says system halting here and locks up. Does anyone have any suggestions?