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How can i determine if graphic card is the problem

Last response: in Graphics & Displays
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June 15, 2010 9:49:01 PM

a friend of mine asked me for his help.
as soon as he logs into windows, a few seconds to a few minutes later, the thing freezes. Then i start seeing weird sort of like pixelated vertical lines all the way across the screen. I suspect its the problem with his video card, but how can i determine if the gpu is the problem, if it is, how can i tell if its bad driver or just bad hardware?

his computer is a hp pavillion media center.
windows vista 32b
AMD chip..i forget which one it is.
Nvidia Geforce 8900 or 8900 GT.

a c 235 U Graphics card
June 15, 2010 10:17:21 PM

switch to your on-board graphics. see if the problem persists
June 16, 2010 2:51:02 AM

Bad drivers, specially on nvidia hardware will most definitely result in a quick BSOD and the PC will restart automatically. Those vertical lines might be an indication of a failing graphics chip. Only way to test is if you can borrow another card or if you have an on-board graphics just like what ct615 said :p 
a c 189 U Graphics card
June 16, 2010 8:31:35 AM

Yep, try as ct1615 said above...
If his PC fine with onboard graphic then he got a dying/broken card.
!