Have you gone to Nvidia's site and updated your drivers? If you the lastest I think I can help you.
-Ibrahim
i have a geforce 3 or 4 not sure, mx 440. It has video out. I have it set to clone, which shows the desktop on the tv fine. However when I open a video file with media player classic or bs player the video is a blank screen on the tv, but shows on the computer. It has to do with overlays but I dont know how to make the video appear. I know that you can make the video on tv full screen and then it will work. But i want exactly what i see on my computer.

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