| Hi and welcome on macosx.com forums
What do you mean by "cease to function" ?
Does it start but cannot play a movie ? Does it bounce in the Dock, then refuses to open ?
If yes, which kind of movie cannot be played ? A DVD ? A downloaded (.avi/..) movie ?
All the DVDs/movies or some of them ?
Could try to repair permissions on your disk (Applications/Utilities/DiskUtility; select your internal drive on the left pane, then click on "Repair permission")
And by the way which OSX do you run (Apple menu on the extreme upper left of your screen, then "About this Mac")
Regards
Philippe |