Macbook pro 13" sound control

Hi
Sound controls (both on the keyboard and menu bar) aren't working.
Sound function is working, so I can hear music/sounds but can't mute or control the volume.
Computer macbook pro 13" early 2011, i7 2700, RAM 4Gb, SSD 120Gb.
But today morning when I connect it to Cinema Display in the office everithing was fine.
Tried to restart few times, shut down and start again... nothing ....
pls help.

Hi h,
Try a PRAM Reset: http://docs.info.apple.com/article.html?artnum=2238

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