Sound is muted and locked on my Mackbook Air

My Macbook Air is four months old and the sound is now muted and locked.
After reading all the forums, I've reset the PRAM (although I have since learned this won't affect it) and also the SMC power management with no success. I have reset, turned the power on and off and have also plugged an unplugged headphones into the jack.
I believe it muted itself after I started watching a VEVO video on a film makers website.
I'm currently travelling and don't have time to leave it at a Mac Store for it to be repaired.
Does anyone have any potential solutions?
Much appreciated,
James

Remove the headphone.
If you see red light in the headphone port, plug the headphone
in and out of the port 5 or 6 times to flip the microswitch inside.
Sound output may be stuck in the digital mode.

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Welcome to the HP Support Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
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Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
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http://i1224.photobucket.com/albums/ee374/Diavonex/6d3191ba.jpg

Sound is muted and locked on my Mackbook Air

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