Last year I got a 2.8 Ghz 8-core Mac Pro, with an Nvidia GeForce 8800GT graphics card. All's been well up until a few days ago - I left it for a while and came back to a black screen and the Mac completely locked up. I restarted it and got a solid orange screen, another restart and all was back to normal. Yesterday the screen started flickering, especially when watching anything Quicktime or using menus. Eventually the thing would lock up and need a restart. I've done a system reinstall (10.5.8), run the startup diagnostic (all fine) so I think the graphics card must be up the chute. The crash log shows kernel panics and mentions nvidia. I read a few articles citing problems with the 8800GT, so would I be right in thinking this is the cause? If so, what to do... I'm not exactly rolling in cash at the moment so getting a new 8800GT is not an option. What about other cheap cards just so I can carry on working? I don't play games of any description so WoW frame rates are irrelevant! Just basic DTP, web design, Photoshop, some 3D. Thanks in advance!