Computer randomly freezing.-Help needed PLEASE.

I have no other psu to try, but I am now running off integrated graphics, with my ATI Radeon hd 5700 card temporarily removed. If it still crashes, I am going to remove ram one by one, then swap psu. If all of that fails- I will RMA the motherboard.
 
Ok, so I used my old brothers graphics card, and it crashed. Using my integrated graphics, it hasn't yet? Please may someone make sense of this.
 
Why can my computer run with integrated graphics, but when I put an graphics card into the computer, it crashes?
 
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Ok now my computer screen crashed on Integrated graphics. It froze, and the screen displayed loads of vertical blue/green lines on my screen. Its obvious my computer is dying big style, but can someone please tell me whether it is the psu or motherboard?
 
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