Sound problem after waking from sleep

When I wake my computer from sleep the external speakers to do not produce sound. This is not related to the 'red light' issue, no red light is shining and in the sound control panel 'internal speakers' is showing.
Interesting is that when I play with the alert sounds in the control panel I can hear them, but when I adjust the volume or try to get sound out of software (iTunes, Quicktime, etc.) I can not hear anything. Also, when the computer is waking from sleep if I quickly toggle the volume control I get one or two 'clicks' before it goes silent. I have repaired the permissions according to other posts but that did not help.
However, if I plug in earphones and take them out again the volume works. . .
any suggestions?

Todd Sackett wrote:
Hi everyone, after waking from sleep, the first sound that is played is accompanied by a hissing sound for the first couple seconds. It does not happen after that at all that I have noticed. It comes out of either the speakers or headphones.
Can anyone try this: (Esp. if you have a new MB Penryn update (most recent))
1) Close lid, put to sleep.
2) Wait 5-10 mins
3) Open lid, log in to iChat (with login sound on) or make some other sound play. Listen for a hissing or static sound within the first couple seconds of whatever you just played.
Thanks for any help!
I don't observe this on my Napa-Revised Macbook

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