Screen hangs and computer restarts


My computer keeps freezing/restarting for no reason. My desktop consists of:
Gigabyte P55A-UD5 Motherboard
Intel Core i5-720
Ripjaws 4Gb DDR3 kit.
Seasonic M12II-620W Power Supply
Windows Vista 32bit

The set up has worked nicely until 1-1.5 months ago when the screen froze over with a green screen with vertical stripes. After reformatting, I have been experiencing the above problem and this can happen 4-8 times a night. I need help
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More about screen hangs computer restarts
  1. Check the card temps? It could be an overheating...
    Or try each stick of RAM individually, bad memory can cause the same problem like yours...
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