Is it my Motherboard, PSU or Graphics Card?

[No USername]

I have my PC with the ASUS P5Qe , GTX 570, and Corsair TX750. Often, the PC works fine but then later the display just dies out. It happens randomly. Is it my PSU, Motherboard or GPU?

 

[No USername]

I live out of town and I have no other PC parts to check it out with