After i upgarde mac os x 10.6.8 to 10.7 i can't hear music through  headset and even itunes coundn't open

when i tried to use headphones i hered scrath sound but wiz out headphn i can listen musics or movies
but once i plug headephn the sound wont work unless i restart my mac.pls someone is been a days i heared musics ?

Try plugging the headphones in and out several times.
Try a SMC reset:
http://support.apple.com/kb/HT3964
Follow directions for a battery you should not remove yourself
Also try a NVRAM/PRAM reset:
http://support.apple.com/kb/HT1379

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