How do i connect the sound from my imac to hdtv?

I am using a Kanex cable from an imac to hdtv, went into system preferences and set the sound to the tv. This worked fine yesterday, but for some reason does not work today.

Hi there brookie.1d,
You may find the information in the article below helpful.
OS X Mountain Lion: Change your computer’s sound output device
http://support.apple.com/kb/PH11235
-Griff W.

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