Using Mountain Lion iOS and audio output will not change from internal speakers to AppleTV so that sound can come from TV speakers, why??

I am using Mountain Lion iOS and trying to connect my MacBook Pro to my plasma TV using AppleTV and AirPlay mirroring.     The video does just fine.     However, there is no audio coming from the TV.     After activating AirPlay I try to select Apple TV as the audio output in System Preferences and it highlights it but then immediately goes back to Internal Speakers and only has sound coming from the MacBook Pro..
What's going wrong ?????
AJ

Are you sure that WIFI network doesn't have an AppleTV on it?  Just because you don't own it doesn't mean there isn't one on that network.  The laptop or better said the OS cannot differentiate between an AppleTV that you own or not.  If it sees one on the network, it will show you one as being available.  The automatic reconnection is happening probably because the last time you streamed to an AppleTV, you didn't drop that connection before sleeping the computer or shutting down iTunes.

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