Videos not playing. shows title but black screen

I am having trouble playing purchased movies, TV's shows, music video etc.  When I click on them the play screen pops up showing title and controls but won't play.  Just shows a blank screen.  I have a Mac book air purchased last year.

What formats are your videos? Not all TV shows can be played in iTunes or QuickTime. If you get some videos,music videos but cannot play them on your Mac, you can convert them to QuickTime MOV, which is certainly playable on Mac, just have a try. You can use this MOV Converter in Apple strore.

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