I have an old P III with nVidia geforce 2 mx/mx400 with tv-out graphic card. Strange when connected to my TV and settings made for clone mode, it gives signal to the TV, but when I try to watch any movie in any format it shows black where the player window should appear. On the monitor everything is OK, but not with the image shown on the TV set. So far beside for the movie file I have not noticed another problem with displaying content on the TV.
I have drivers downloaded from nvidia's site and k-lite mega installed.

Any suggestion why is this happening, and how to solve this strange problem?