Audio grayed, non-adjustable after using HDMI cable

I have just installed Lion on a 2.66GHz 13in MacBook Pro7,1. After connecting to a TV monitor via the Apple HDMI cable and then disconnecting I am unable to adjust the audio on the internal speaker output. The audio button on the menu bar is grayed out and the physical audio controls show a Ø symbol as unavailable. The device "Internal Speakers" states "The selected device has no output controls". I have rebooted several times to no avail. I have tried various combinations of re-connecting the monitor, rebooting, disconnecting, but there is no way I can get the internal speakers or the volume controls to work.
When I connect an external speaker via the headphone socket the sound settings are resurrected and the audio control button is reinstated.
I have used a late 2010 MacBook Air 11, also running Lion, with the same monitor and same cable but have not experienced the problem.
Can anyone suggest what I might try to get things back to default?

Some HTIB systems only switch HDMI and pass its audio, but don't process the audio. My Yamaha HTIB is an example.
You need to run a separate optical or coaxial audio cable from your sources to the HTIB receiver. I do not reccommend downgrading to component - continue with HDMI, just use it only for video.
In my case:
PS2 to Yamaha optical - since the PS2 doesn't do HDMI and is my only component device, video goes directly to the TV
Cable box to Yamaha is HDMI + coaxial (Yamaha only has two optical inputs)
PC to Yamaha is DVI-to-HDMI + optical (Even if the Yamaha did process HDMI audio, this connection would need the optical cable anyway)
There is an HDMI cable from the Yamaha to the TV. The Yamaha can switch between cable and PC inputs for me. I need to switch inputs on both the TV and the Yamaha for the PS2.
*disclaimer* I am not now, nor have I ever been, an employee of Best Buy, Geek Squad, nor of any of their affiliate, parent, or subsidiary companies.

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Claudiamil-
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It's do-able, but I don't think it's a great idea.
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This is one of the BIGGEST reasons why I would want to take my PC and chuck it into the nearest heavily traveled lane of traffic and watch it get completely destroyed by any vehicle that runs over it then go buy a MAC. The idiocy involved in doing such a simple task is revolting.
FIrstly, and in no way am I directing my ire at you specifically, I have already performed almost everything you have listed for me to try... PREVIOUS to me posting this cry for help.
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