Mac Air(OSX) stuck on mute! no devices visible in System Preferences Sound Output/Input

I have a MacBook Air, Version 10.6.8, Processor 1.6GHz Intel Core 2 Duo.
My Sound is stuck on mute:
-when I go to System Preferances>Sound and go to Output or Input, under "Select a device for sound input/output" there is nothing listed. There at the bottom also the Mute checkbox is also stuck and can't be changed.
It always gets stuck after leaving it in sleep longer (3x till now).
1)The first time this happened, I restarted the PRAM (OPTION+COMMAND+P+R after restarting it) and it helped. The sound worked after that.
2) The second time the method from 1) didn't work, so I tried updating COMBO and then I restarted the SMC (CONTROL+OPTION+SHIFT+POWER BUTTON) and it helped everything was fine after that. The sound worked after that.
3) The third time (all three time in a row) nothing worked (I tried):
      -restarting the PRAM
      -restarting SMC
      -Reparing Disk Premissions in "Disk Utility"
      - I tried deleting some files in the Library>Preferences>...
      - I tried restarting
      - I tried inserting headphones (still no sound)
      - I tried playing some music in the Garage Bend
       - I tried restarting
       - I did not update COMBO the escond time (it would be crazy to update combo everytime this happens, and it happened three days in a row)
Please help me. I have no sound for a week!!!

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Mac Air(OSX) stuck on mute! no devices visible in System Preferences Sound Output/Input

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