I built this computer from the ground up a few months ago and I've been having this problem ever since I started booting it up. I've updated the drivers for this card a couple of times. I initially installed the 32 bit version of vista, then a couple days ago the 64 bit version. Still having the problem.
Basically, whenever the monitor gets power again or comes back from a standby state, the windows backgroun will go from clear to a blury lined mess after a few minutes. Then, I navigate to display settings and change the resolution from either 1600 x 1200 to 1280 x 1024 or vice versa. So I change it and that fixes the blurry lines the first time. A few minutes later, blurry lines come back, I change resolution back to what it was before, and it goes away for however long I might be at the computer. But this issue persists after time away and the monitor has a chance to go to standby.
Monitor is a 19" Samsung CRT, about 7 years old. I'm planning on going out and getting a new one, but I am curious what exactly the problem is. Monitor or card? I have updated my card drivers several times.
I noticed that in Bethesda's Oblivion, I could start up that game and never experience this issue, however in recently playing Fallout 3, I would often get blurry screen issue, and exiting out of the game and changing the resolution for the game graphics would also fix that issue.
Any advice would be greatly appreciated.