mplayer full screen

Hi All,
I am running Fedora core 7. When I play movies with mplayer,
it does not play in full screen. Even if I press f for full screen,
it plays the movie only in the center portion of the screen.
I also tried mplayer -vo xv movie.avi .. It plays in full screen,
but dies after sometime saying my system is too slow. I guess is
has some thing to do with the video cards.. is there a fix ?
Regards
Deepan
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