2011 Macbook Pro Audio Output(only one ear)

Hi, I own a 2011 Macbook Pro and as stated above I can only hear out of my left ear. I've tried multiple headphones, checked the settings and tried changing the balance and it completely shuts down the music if I move it over to the right ear.  Any suggestions to try fixing it?  I am running OS X Lion as extra information.
Thanks,
Max

If a PRAM reset does not solve the problem, then a trip to the Apple store is in order:
http://support.apple.com/kb/HT1379
Ciao.

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