My sound has stopped working completely

My sound was working fine last night the this morning i turned my Macbook on and downloaded the new itunes and stuff and realised that there was no sound?? When i touch the increase/decrease volume buttons on the keypad the normal thing pops up but with a stop sign under it and the speaker icon on the top right of my screen has gone grey?
Would love to know what's going on please.

Try a PRAM reset:
http://docs.info.apple.com/article.html?path=Mac/10.7/en/mh26871.html
Ciao.

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