I just built my new computer. I bought Geforce gtx 570 ti FARSA graphic card wich keep on crashing down in a random amount of time... the screen says "no signal". its really driving me crazy. when I try to change my background picture it crashes back to "no signal". its up to date. Im using
I forgot to mention its not the heat. it stays on 36 - 40
Can't find anything about that PSU, which means it's probably a cheap, no-name unit. NVidia recommend a 550W PSU for that card. Probably not strictly necessary if you have a top-notch PSU from someone like Corsair.
I'd lay odds that PSU is the problem.
Are both 6-pin and 8-pin connectors connected to the graphics card? I think it's the power supply as well if you connected both connectors.