If you match, Finley's configuration (FC4), just write/try these commands:
... desktop >> preferences >> removable drives and media >> multimedia tab.
Play audio CD discs when inserted:
xine --auto-play=w --auto-scan=cd (configures xine to not have the visual window only the player)
Play video DVD disks when inserted:
xine --auto-play=f --auto-scan=dvd (configures xine to play the movie fullscreen)
can't explain why or how, but, the command for watch DVD's only works with the DVD RW+ drive, and NOT with the other DVD/CDRW (combo) drive.
I had read that from here, and simply, it has been working for me:
...and hoping, works for you too!