Why is the sound sometimes not available?

I noticed more lately that after starting my mac, there is no sound, not volume slider in the menu and not even a sound device available. After restarting it's back again. Why is this?
André

Try setting the PRAM. Restart the computer. After you hear the chime sound (if you hear it, if you don't wait until the screen just turn silver), press and hold optioncommand+RP to reset the PRAM. That should work.

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