My Macbook Pro speaker cannot play

My MBP speaker suddenly have no audio.
There is not built in speaker option for me to select in the audio output selection.
And i also cannot find this file in the my library "com.apple.soundpref.plist"
the audio jack port have also a red light lit up.
But when i am running bootcamp, I do not experience this kind of problem.
the speaker is able to running as normal but the audio jack port still has a red light lit up.
Can anyone advise me?
Many thanks in advance.
Vincent

If you see red light in the headphone port, plug the headphone
in and out of the port 5 or 6 to flip the microswitch inside.
Sound output may be stuck in the digital mode.
If that does not help
Reset PRAM.  http://support.apple.com/kb/PH4405
Reset SMC.     http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
Best.

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