TS1574 Sound only from Left Headphone w/ MacBook Pro

Any external headphone that I use with my 13" Macbook Pro, the sound only comes out of the left headphone. The slider in my System Preferances is in the middle, and the headphones are all the way into the jack. Any ideas?

Often resetting the settings helps.
Syst.Preference > Sound > Output > External
Try 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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