Updated to 10.5.4 on my Air - but the SOUND has gone!

I just updated my OS today, and as a result of the update, the volume control has gone away. There is no sound on the laptop. On the Sound menu - it says it does not find any output devices!
Can you help?

Hi,
I just had the same issue and found an answer in this forum. I'm not sure how to refer you to the original post but here's the solution that was recommended and it worked for me:
PRAM Reset
http://support.apple.com/kb/HT1379
Good luck.
Original thread: http://discussions.apple.com/thread.jspa?threadID=1564785&tstart=210

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