I have the same vid card, it's full of derp. I haven't had that problem, but mine crashes when running multiple things at once sometimes (games + movie)
Yeah the 5850 has had some problems that are known of but none the less its still a nice card. Have you tried any of the following:
1.) re-installing drivers?
2.) Full disconnection of the Card in your tower then re-connecting it?
A Friend of mine has the same card and he says sometimes the drivers like to mess up for no reason. Once he had to remove the card then put it back in for some reason so that is why I put the second suggestion though not sure how truly effective it might be.
Yup, get driver sweeper, if you can find it... all DL links have been removed as it's no longer 'supported'... I have it though, so if you can't find it, I'll upload it to mediafire or something...
They are absolutely not. Driversweeper finds all the shit (either nvidia or ati, you choose), it displays what it wants to remove, and you choose what to delete/keep (it's straight forward), and presto. Gone.
Have you tried
1) re-installing the drivers
2) ajust your resolution
3) have proper leveling of both screens in the sence of visual data( video pictures do they all line up from one screen to the other)
4) dead vga card?