Right speaker not working - MacBook Pro

Help. My right built-in speaker just stopped working. I ran the trouble shoot in Settings to ensure it was all set up correctly and it is. Any advice?

Try a PRAM reset:
http://support.apple.com/kb/ht1379
Is the right channel silent using ear phones?  You may have a faulty speaker or there is a software problem.  If the PRAM fails, the Apple store genius bar is the place to have the specific problem defined, and hopefully corrected.
Ciao.

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