I was tasked to fix my friends Intel iMac 2ghz. He was running bootcamp and used only Windows because whenever he'd boot into OSX 10.4 a peristent spinning beachball would prevent anything being done, and require a hard reboot. There was also video interlacing and artifacts on the screen on the mac side, and would only show when booted into OSX, not during the boot process or within windows. Though a random error message regarding the video would display, warning about the VPU. I performed a clean install of 10.5, and it locked immediately upon first boot. The video artifacts remain, but in different places with the fresh OS, and when I click anything or attempt to open Software Update, the system freezes with the spinning beachball again. I can move the mouse around, though I can't select anything. I zapped the PRAM and am unable to boot into open firmware for the NVRAM reset. Is the possible to load windows using Bootcamp and bypass the mac altogether? i've never used bootcamp so i need all the help i can get. thanks.