I can't hear sound after upgrading to lion

I have this little annoying problem with my iMac after upgrading to Lion OSX. After waking up my iMac I can't hear any sound from internal speakers, ie: only video on Youtube, but no sound, but whilst pressing volume up/down button I can hear beep. When it happens So I have to restart system everytime it happens. Anyone any ideas or maybe someone out there has the same problem?

I'he double checked everything, only 1 output device (internal speakers). As I said before, it is weird because I can play iTunes and can hear "beep", but neither youtube sound, nor game sound or internet radio seems to be working, no sound whatsoever. But this time system didn't go to sleep, it has just happened suddenly.... Restart again then!

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