i have a antec 300 case, with sli evga gtx 260 with a antec tp-750 watt power supply. today i was in the middle of a game when the computer just froze, the screen froze and my mouse was non stop flashing. And on when i rebotted the computer the graphics cards were not working, and my mouse was still non stop blicking and my keyboard was not being recognized, this is a 1.5 year build and i have not had any problems before this. My motherboard is a xfx 780i, and i think its the motherboard that went bad, but i am not sure. I dont have another computer to swap parts out to see which part is disfunctional, so i would like to get some other people opinions on what happened. I think it was the motherboard since the mouse and keyboard isnt working, and i dont think having both graphics cards fail at the same exact time is that likely expecially since i dont overclock.