From your description, I don't think it's happening when you are playing a
movie. I think it happens when you start to play a movie and when you stop
playing a movie. These are the points at which the system changes the
display mode.

If it happens during a movie then you have a fault in the monitor or a
problem with the display adapter.
--
Jeff Richards
MS MVP (Windows - Shell/User)
"as_ca06" wrote in message
...
I tried Samsung and viewsonic, but it's only happed with Samsung when
watching movie!!