Headphone Jack on MacBook Pro Not Working

Hello,
The headphone jack on my MacBook Pro is not working properly.
When I plug in my earbuds or headphones only one side of the headphone or earbud is working and the other side is "muted".
I am certain the problem are not my earbuds or headphones because I use them with other devices and they work just fine.
Can someone help me how to fix it?
Please and thank you much.

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.    AudioMIDI Setup
       Applications/Utilities/ Audio MIDI Setup.app
       Audio Devices window
       Side Bar
       Click the Built-in Output.
      Make sure that CH1 and CH2 volume sliders are matched.
3.   Reset PRAM. http://support.apple.com/kb/PH14222
4.   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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Headphone Jack on MacBook Pro Not Working

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