Hello, my PC won't display anything! It's running a asus p5n32-sli mobo with 2 x geforce 7950gt graphics cards in sli. The display failed last night whilst running a non-graphics intensive music program. The monitor and cables are fine, and i've tried both card singly in both 16x slots. I've also tried running a single card in the 8 x slot. I know it's all a bit old now, but I'd like to keep it running if poss. Is it likely that both grafix cards failed at the same time or is it a mobo failure? Please help!