Just wondering if anyone has any idea if this is fixable or not. I have a Mac Pro 1,1 with an Apple (not pc flashed) ATI 5770 1gb gpu. It can run for hours sometimes without issue, or sometimes just minutes it can remain ok then suddenly it will go nuts and will display lines and flashing on the screen with screen tearing etc. The only way to resolve is or regain control of teh mac is to hard reset the Mac Pro by holding the power button then boot again. It happens with OSX or Windows via Bootcamp. I tried it in my friends Mac Pro 3,1 and it ran a full 720p movie till the end then 10 minutes later when we removed something from the front MP's front usb port it happened all over again. I'm thinking its some sort of power issue (after the USB removal freak out) but I've no experience with this exact model. Would replacing the ATI's 6-8 pin power cable help or maybe one of the dual 6-pin to 8 pin cables to maximize power for the gpu? In my MP 1,1 when I use my Apple Nvidia 7300gt there are no issues whatsoever. Any ideas?