When I try to watch a movie that I bought I can hear background music and characters speaking but my screen goes black

Hi lrsalino,

Thank you for contributing to the Apple Support Communities.

If you're not seeing video on your MacBook Air or Cinema Display when watching a movie from the iTunes Store, I recommend the troubleshooting steps found in Get help with video issues on external displays connected to your Mac.

This article covers a wide range of troubleshooting to help solve the behavior you're seeing.

If those steps don't solve it, you may also want to Report a problem with an item purchased from the iTunes Store, App Store, Mac App Store, or iBooks Store.

Cheers.