[Naki]

I have a Nvidia GF 6800 GT card (AGP).
The problem: Video clips (movies/etc) played on monitor, do not show on TV. TV is set to clone the monitor.
The other parts of the screen show OK, e.g. window borders and other areas, menus/etc. But the video itself shows as black.
When not playing video, all shows OK.

(Note that the screen colors appear OK, i.e. this is NOT a black & white problem.)

Any ideas how to fix? I think using TVTool may help, but I'm getting trouble setting it up. I had to do a System Restore due to lost signal on both TV and PC...
I tried several different video players, including KMPlayer, WMP, and VLC - all show video as black on the TV.

TV is analog, 29" Sony CRT TV.

[CoffeeFiend]

It depends on what video renderer you use (overlay, VMR, etc), and which between the monitor and your TV is set as the primary display.