Can't get ATI Radeon 4850 to work properly

Here's my system setup that I just built:

CPU: Intel Core i7 920 2.66 ghz
Memory: Corsair 6GB 1600
Graphics: HIS ATI Radeon 4850 512mb
Case: Antec 300 with Antec 650W PSU
CPU Cooler: Xigmatek Dark Knight
HD: WD 500gb 7200
Display: LG 21.5in 1080p LCD

I've tried Windows 7 64 and Windows Vista 32 and everytime I try and run a game it crashes 30 seconds in. The screen goes black and the computer restarts but the screen never comes back on. I also try and run the Windows Experience Index and it crashes during the ALU Assessment everytime. I have tried the drivers that come with the graphics card, Catalyst 9.5 and 9.6. Can anyone help me with this problem it is getting pretty frustrating. Thanks in advance.
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  1. Welcoem to the forums!

    Run memtest86+ and check for errors.
    Did you set the memory voltage?
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