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4850X2 DVI out problems?

I got in a Sapphire 4850x2 last week and I'm running into issues with it being connected to my DVI cable to my Dell 2405 Monitor.

Anyways...I get signal out during BIOS bootup, but when you hit the windows login screen on Vista, I lose the signal. I had it working when changed my BIOS setting of PnP OS from yes to no, but a couple days later I went to start up Left for Dead and I lost my signal totally and it did same thing before when I started windows again.

I'm thinking its a driver issue since it works fine with no drivers installed and during BIOS. Is anyone else running into this? Its rather frustrating since before this I was having the opposite problem with my crossfired 3870's I had..they wouldn't work in DVI during book up but worked fine once windows started.
 
im having the same problem, but runnin a 4850 x2 + 4850 coming from 2x 3870

going to win7 and beta ati drivers solved for me
 
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