My mac book pro won't connect with the TV. I've watched tv many time through my computer and now it won't link tougher. how do I get it to work again?

How come I can't connect my Mac Book pro to my tv? it use to work but now it wont. how do I fix this?

Checkoneaudio,
which model MacBook Pro do you have, and which version of OS X is installed on it?

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