Internal speakers no longer work in 10.5.7 (17 inch MacBookPro)

I have a MacBook Pro 17 inch 2.4 GHz Core 2 Duo (model MacbookPro3.1)
After installation of 10.5.7, the system does not seem to recognize the built in speakers anymore. The sound preferences panel only shows "Digital output" as an option, volume cannot be changed, the audio port lights up red whenever I try to play sound. The system acts as if digital optical output is connected while the port is empty.
If I plug in headphones (normal iPod headphones, not optical), they work and the sound is adjustable. So the system does switch to analog in that case. But when I unplug them again, everything reverts back to digital output, volume no longer adjustable, red glow in the port, no sound.
But: the startup chime does come out of the internal speakers!
Any ideas on how to get my speakers back to normal functionality?
Thanks,
Michel Colman

Hi,
I have the same problem but in the opposite direction.
My internal speakers work just fine, but my system does not recognize the inserted headphone any more (even when i plug in my headphone the sound continues to come from the internal speakers).
I explained my problem in this thread:
http://discussions.apple.com/thread.jspa?threadID=2028346&tstart=0
Do you have any suggestions?
Have you found a solution?
Thanks

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Ronda and Dave2,
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