HT1338 my sound has a permenant mute selected i went to the system preferences and it is not checked in the box and i have no sound other than the sound that comes on when i restart my computer

After some updates i noticed my sound not working. it has the symbol of mute but the mute button is not selected in the menu the out put says no devise selected what can i do to get my sound to work again.

Seems to be hardware but try:
PRAM RESET. http://support.apple.com/kb/HT1379
and still not working
re update the machine. Download this and re update  10.7.4( if you are 10.7.4)   http://support.apple.com/kb/DL1524

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