Left Audio Only From Headphones Jack With External Speakers

Yes, the balance is set properly under the sound system preferences.
So here's the problem, I have JBL Encounter speakers connected via the headphone jack and since yesterday only the left speaker produces sound.
I've plugged my ipod into the JBL speakers and they work fine. I've also used headphones with my computer and again, left audio only.
I've even switched the right and left satellite speakers and again only left audio is produced... though on the right (side) satellite.
Any thoughts on how to correct this? The nearest apple store is 2 and 1/2 hours away so I'd prefer not to go if there is another fix.
My three month phone service is up but I'm still covered under the apple care for a few more months.
Thanks in advance.

Sounds as if your headphone jack is either defective or has been damaged by having a cord yanked at some stage, Kanji
It is either a trip to your nearest AASP or a mailing box from Apple to get it resolved. Applecare will cover it if the problem isn't due to accidental damage (though a cat tripping on the cord can be enough to produce such results and the price could accordingly be substantial as the port is mounted on the logicboard on recent MBPs as I understand it) .
You might want to try a regular pair of headphones in the socket to make sure the problem also occurs with them, too, though.
Cheers
Rod

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