The mac book pro cannot detect the internal speaker. What's the possible causes? and how to fix it?

I've connect the mac book pro to my LED TV with the headphone port as my audio output. After I disconnect it, the internal speaker did not work and the mac could not detect it from the system preference. What is the problem? Is it because of the hardware or software problem? Please help.

Please detail all you have done to resolve your issue.  Need this information so that the users can avoid the "been there, done that" scenario type responses.  This is to avoid repeating the troubleshooting you may have already tried.  Thank you.

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