well fedora 11 has had and still has sound problems .
not all sound cards seam to work well
my current problem is that movies and music i play play for a bit, and then stop mid way through. first it starts skipping, and then it just stops,
This sounds like a ram issue .
What is the system ram ?
dose this happen for only a "store bought" dvd or including any you might have DL'ed from bittorrent.
it also might be a problem with libdvdccs if it is a dvd movie you bought
also mplayer ( gnome-media player) is known to have problems with movie dvd's
VLC is the recommended player for those