Not getting any sound from my macbook pro

not getting any kind of sound from my laptop. sound icon on the status bar is gray and it shows error sign "circel and a slash / in the middle. on the system preference sound output is blank and the mute box is ticked and i can't change it. eveything was working fine 2-3 hrs ago and the laptop was on sleep mode and the nest time it was not working. and microphone is also not working, itunes songs are not played and quicktime player is showing an error but on other app like VLC songs and videos are played but no sound. PLEASE HELP... in a horrible situation .

Have you tried earphones?
Follow these e directions and delete the System preferences plist:
https://discussions.apple.com/docs/DOC-4301
Ciao.

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