No audio after downloading Mac OS X 10.6 Snow Leopard - any suggestions??

I bought the disk with Mac OS X 10.6 Snow Leopard directly from Apple. After installation, my audio no longer works. The Macbook still makes a sound when booting up, so the speakers still work, but I cannot get any audio to work now. Help!!!

Hello,
I had this happen to my PowerBook, I Just reset the PMU and it worked fine after rebooting.
For a MacBook, try resetting the SMC
http://support.apple.com/kb/HT3964
If that don't work try resetting the PRAM
http://support.apple.com/kb/HT1379

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