I have been having this reoccurring issue on just one of my screens. My right screen/main screen on my Mac Pro 2.8GHz seems to go dark on me, only in a few programs though. Safari and Lightroom mainly as those are the ones I use mostly on that screen. Here are a few screenshots (taken with my P&S as I wasn't sure if a screen grab would get it.) **Update, looks as though the screen grab got it, not the video card? What could it be otherwise? Screengrab Good - Bad - It seems to happen once in a while, when it has been running a good bit which is why I thought it was the video card, too hot or something. Anyone else having this happen to them? Is a program interfering or something? Any help would be greatly appreciated! Thanks in advance.