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I've been having issues with my video cards (2x ATI Radeon 5850s) the past couple weeks. Basically whenever I go to load any game or furmark in fullscreen mode I get black screen for about 2-3 minutes, then it loads. Once it loads, it's 100% fine, or if the application is in windowed mode it's 100% fine (FPS is where it's supposed to be). I thought possibly it was a drivers issues or something so I reinstalled drivers, didn't work. I decided I didn't wanna mess around with the finicky stuff so I just up and formatted and started clean. Still had the same issue. I then removed one of my video cards, and the issue was solved temporarily (this was a few days ago). I immediatly sent the video card in, but they wanted to check it out and stuff before they gave me a new one. I said no worries I still have 1 good card. Today I had the exact same issue with my 5850 which I thought was good, and it's not like now it sometimes gives me grief and sometimes not. Everytime I load a fullscreen game or furmark I get that annoying delay, but again windowed or windowed fullscreen both work 100% fine. What could possibly be causing this? Maybe it's just something as simple as changing a setting in catalyst? I'm at a loss here, and hope someone can help me.

Also, I just did a furmark run with both fullscreen and windowed at 1920x1080 and got 1745 for the fullscreen and 1786 for the windowed.

Further note. I have a 2 monitors and while Furmark was running on one monitor I was using firefox on the other, and firefox was laggy when I was doing both tests.
Work in Progress
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-930 ASUS P6T Sapphire 5850 6 Gig DDR3 1600 
Hard DriveOSMonitorPower
2x 500GB Seagate Barracuda RAID Windows 7 Syncmaster 2343 / Syncmaster T240 Corsair 850W 
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Work in Progress
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-930 ASUS P6T Sapphire 5850 6 Gig DDR3 1600 
Hard DriveOSMonitorPower
2x 500GB Seagate Barracuda RAID Windows 7 Syncmaster 2343 / Syncmaster T240 Corsair 850W 
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