Speakers suddenly stop working. Icon greyed out?!

Hi all.
I started my laptop this morning to find that the speakers don't appear to be working. For no reason whatsoever. They were working last night. And now they're not.
I press the volume up, down and mute buttons and it does nothing. The 'overlay' comes onto the screen showing like it has max volume, but with a circle/cross underneath (imagine a no smoking sign).
In the top menu bar, the sound icon is there but it's greyed out so I can't do anything.
Anybody help me please?!?

the same thing happened to me. I closed my laptop to take it upstairs to work some more and when I opened back up the sound icon was greyed out. I tried plugging in speakers and a headset and they work fine. I think that it is probably the logic board but I read here : http://discussions.info.apple.com/thread.jspa?threadID=2244270 that it could just be the internal switch. I have a late 2008 model and the post seemed to mention models of that date. Let me know if you figure this out.

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