I need help. Earphone won't work on stereo

I have late 2012 macbook pro, upgraded to mavericks, and when i plug my earphone it won't work on stereo. the left earphone doesn't produce sound. I thought it was my earphone but apparently my earphone is fine when i plug it into my phone. Fortunately the internal speaker still works on stereo. Has anyone ever experienced this ? I can't work if there's no music.. please help!

Go to Applications > Utilities > Audio MIDI setup and see what the settings look like for built in output. Maybe the left channel is muted.
I'd try another pair of earphones too. Maybe it's the earphone jack on the computer.

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