My volume won't now work on my mac after sofware update 30/11/12

Hi
My volume wont work on my mac the only sound is when i switch the mac on the volume icon in the top right is shaded and both F10 and F11 keys wont work i have also tried going into prefrences but no joy i have had a look on the back regarding red light poss in headphone jack even though this has never been used.

Hello,
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
Open Audio Midi Setup in Applications>Utilities, see the input & output options & KHz setting there, some things will change it for their own use, then not set it back.

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