Hi guys. I'm in a bit of trouble at work. One of our Mac Pro's won't display anything. It starts up as it should be the screen stays black. We've tried with several monitors. A Mac Partner was 99% sure it was the graphics card which was the problem. So now I'm thinking about just finding a new graphics card and replace it myself, but I have a few questions. The original card was a ATI Radeon HD 2600 XT (256mb) and I've tried to find some suppliers for this, but it seems its not that easy to get your hands on so i was hoping that we could upgrade it to a newer one instead. But I need to know which ones will actually work with this model and if they need to be a specific version of model to work with the Mac Pro. Any suggestions would be welcome. EDIT: I was thinking about just buying a HD5770 from one of our local stores - would that be an option?