Audio not working MacBook Pro 15''

My internal speakers are not working and seem not to be recognized by the OS. I am running Lion. Under Preferences>Audio there isn't any option for the internal speakers. Headphones are still working.

I had the same problem and after a bit of research discovered that the line in is not getting enough input from an unpowered set of headsets.  ALSO, the mic level was set too low and so nothing was being picked up.
Solution:
I have a Thunderbolt Express Dock (expensive I know but very handy) and plugging in through the express dock with the mic level up works great.
Alternatively, I also have a USB Headset Connector that comes up as a seperate device and also is able to take inputs.
Finally, if neither of these work, I found that the earth chassis on my Macbook Pro 15" was a bit unpredictable.  I removed the base cover, cleanes the contact points (little silver spring loaded buttons on the edge of the main board) and where the contacted the cover and this also improved things.
Regards,
David

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