I have my computer setup with dual monitors but a couple issue still linger.
When I use my screen capture tool, it is only able to allow me to capture the screen on the main display. I can't capture on the extended display. I'm not sure if this is normal and is usually the case or if it should be able to allow me to capture either screen.
The other thing I noticed was when I capture on the main display a video file, the still turns out black. Only the the player and surrounding is captured but the actual video is black. I can't remember if this has to do something with hardware acceleration or another thing. But I've always been able to screen capture a video frame and it would capture normally.
The last symptom is, when playing video files, or watching youtube videos etc., the video has a sort of choppy line (looks like the horizontal interlacing thing) where the frame seems to be slower which is why the horizontal segments seem to appear a lot in the videos.
Now I tried it on both my AMD Radeon 6870 card and now my backups of GeForce 6600 GT and 9400 GT. I think i remember when I tried to access the hardware acceleration, it was greyed out so I don't know how to manipulate hardware acceleration settings if this is the reason.