Lion Installed: Internal speakers muted and cannot be adjusted thru the audio pane.

I installed Lion yesterday and spent considerable time looking for an online solution to no avail.
The online info suggests to re-install the OS from the disk supplied with the laptop, but would be re-installing Snow Leopard... mmm
The quick fix is the plug headphones into the audio jack and wait a few seconds. The audio pane becomes active as it should. Remove the
headphones... the audio functions normally.
If you turn the laptop off... you must repeat the process until a future release of Lion.

Same problem here: I cannot control audio volume and Preference Panel said I've not an audio out device. the funny thing is that I can hear music from iTunes.
I've tried also to reset PRAM.
MBP 13'3 mid 2009

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Lion Installed: Internal speakers muted and cannot be adjusted thru the audio pane.

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