Hello, So I just bought a MacPro 1,1 used last week and loving it. However I'm having 1 problem with it. Sometimes when I turn on the computer the screen doesn't show a picture however the system fully boots and I'm able to use logmein and use the system. I know my screen is good I plugged it into another system and tested it multiple times. Now as I'm typing this up I have the side open and the fan on the video card got pretty loud for a couple minutes. (Already tried cleaning it). which makes me think even more that its the video card. Couple times when it did boot there was a couple gray lines on the back of the wallpaper. I have attached a picture that I made to show you what it was doing. Even though I did this quickly in Photoshop. Its pretty much what it was doing. It turned off a couple times on me as well. I have tried 3 different cables. (NEW DVI, HDMI/DVI, SVGA(DVI ADAPTER)). Thank You. Ps. Sorry for my english If I have to I will go down and buy the 5770 Apple ATI Card.