Sound from the left doesn't work on my MacBook pro. This includes when using headphones.

This just recently happened within the week. I've updated to Mavericks a long time ago so I'm not suspecting that. Any suggestions?

Go step by step and test.
1. System Preferences > Sound > Output > Internal Speakers/Headphone
    Settings for the selected device:
    Balance:
    Make sure that the slider is set at middle.
2. Reset PRAM.  http://support.apple.com/kb/PH4405
3. 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".

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