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Can't get ATI Radeon 4850 to work properly

Last response: in Graphics & Displays
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June 20, 2009 11:21:24 PM

Here's my system setup that I just built:

CPU: Intel Core i7 920 2.66 ghz
MOBO: ASUS P6T SE
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.
June 29, 2009 12:34:17 PM

Welcoem to the forums!

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