HUGE PROBLEM Geforce gtx 570 ti FARSA

[ssjomer]

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

manufacturer : gigabyte

processor : interl (R) core(TM) i5-3470 CPU @ 3.20 GHz 3.50 Ghz

installed memory : DDR 3 8 GB

in 64 bit.

please. please help me. its driving me crazy

 

[Sunius]

What's your power supply unit?

 

[ssjomer]

What's your power supply unit?

TopCool realpower 500W

 

[ssjomer]

I forgot to mention its not the heat. it stays on 36 - 40

 

[Ijack]

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.

 

[Sunius]

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.