Hey all, I'm having issues with my iMac, I'm guessing something to do with the graphics card maybe? Problem only started up today, can't think of any reason why. Screen flickers with the black half flashing on black, then I get small flickers all over the screen, then it just freezes. Will try and get a photo up if I can. Mac is out of warranty. If anyone has any suggestions, or info on what I'd need repair wise or a rough idea on how much, it would be much appreciated. Thanks for your time. Luke.