After installing Mountain Lion.  Under sound, where it says select an output device, it say no output devices found and there is no sound.  How do I fix this?  I have reinstalled the os twice and still the same.  I have also repaired permissions.

After installing Mountain Lion.  No sound. Under sound, where it says select an output device, it says no output devices found, and there is no sound.  How do I fix this?  I have reinstalled the os twice and still the same.  I have also repaired permissions.

Try resetting the PRAM and SMC...
PRAM Reset:
http://support.apple.com/kb/HT1379
SMC Reset:
http://support.apple.com/kb/HT3964
Hope this helps!

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