My iMac 5,1 has the ATI X1600 graphics defect, probably needs a new logic board. Green checkered parterns all around the screen and applications crash when I delete the drivers. I know logic boards are an expensive fix, but I've heard of people getting it done for free and that gave me hope and made me make a genius bar appointment for 3:30 tomorrow. Anybody here get theirs replaced for free? Even if they don't and there's no way I can afford it, at least I'll get an estimate.