New retina display hdmi out not working

I have been connecting my new mbp to my tv for weeks and have not had any problems. Yesterday, I went to connect it through my hdmi and my computer is no longer recognizing that my tv is connected. It switches modes and configures my desktop like I have the external hooked up (I can drag things off my laptop display) but it is not sending a signal to the tv. I have switched out cables, tried a different TV and searched online. Why is this all of a sudden happening after weeks of normal function? Is it related to a software update?? very frustrated...

Some users have reported (in these forums and elsewhere) that they had a problem after installing 10.8.2, but that problem caused both the internal and external screens to go black.
I regret to say I do not recall reading about anybody else with quite your problem.

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    ~~~~~~~~~~~~~~~
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     Cheers, Tom

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