ITunes won't play content as it says my monitor is "unauthorized." ***?

When I launch a downloaded movie on iTunes and try to play it, I get a message that "protected content is attempting to be played on an unauthorized computer."
I have a 27" 1920x1200 Dell connected to a 13" MacBook Pro with Snow Leopard. The monitor has worked fantastic with the MacBook always. If I drag the movie to the MacBook Pro's monitor it comes on, drag it back, it blacks out.
Eventually, it will start playing what I want on the big monitor. Any ideas here? Thanks!

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Did you delete the hard copy of the songs from your computer after you uploaded them?
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Posted: Jan 14, 2008 2:23 AM
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Hey guys, here's my problem.
I had some major issues with OSX last week that a trip to the Apple Store couldn't fix. Their only advice was to save all my pictures, music, documents, etc. and reformat. I did that yesterday. I reinstalled everything and then downloaded all the most recent updates.
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ITunes won't play content as it says my monitor is "unauthorized." ***?

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