I am running a MBP with 1600 radeon video card and it is supposed to work with a 30" apple display. I think I have been having problems when calibrating for some time. However I am running the display now and it works fine except for when I try editing photos with Iphoto. I open up an image and make adjustments with the sliders, and the image gets horizontal, sometimes angled scrabled lines through the picture. I reset the sliders and then the image looks fine. Do you think this is a video card problem. I have 3 gigs of system memory and the card is supposed to work fine with the monitor.