No sound from integrated loud speaker

Hi,
I have no sound from integrated loud speaker, only if I use my headset, I can hear something. There is no red light, so should be a software issue. When I restart the mac, I hear the start sound. I already reseted the PRAM, didn't help. I installed OS X Lion 10.7.4 and did the software updates.
Any idea? Thanks!

Reset SMC.   http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
If that does not help, contact Apple.

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