Late2012, RMBP. Only left side of earphone works.

When I plug in my earphone (iphone 5 earphone), only left side works, and Im sure this is a good earphone.
I used to adjust the banlance, and sometimes this works that both sides will work after my manual adjustment. However, now, this way wont fix the problem.
What's the problem here?

1. Reset PRAM. http://support.apple.com/kb/PH4405
2. 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".
3. Close all windows and quit all applications.
    Click "Go" menu in the Finder menubar.
    Select Computer, then Macintosh HD > Library > Preferences
    Open "Audio" folder.
    Right click these two files and select "Move to Trash".
    com.apple.audio.DevicesSettings.plist
    com.apple.audio.SystemSettings.plist
    Close the window. Restart the computer.

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Help me please , Only Left side no sound !

had a ipod 30Gb in xmas, very happy. but T.T
yesterday, i found right side is lounder than left side . then a hours later , left side has no sound!
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I'm also having this problem even thought it worked perfectly well before
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Go to Solution.

I see
this might help
http://talk.sonymobile.com/message/448070#448070
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Hi...! Only one side of audio working...?

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http://www.ipodrepair.com/
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When I plug my Head phone that came with the Iphone 4s the left side is not working, it was working before all the new upgrades is anyone else having the same problem?

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VoiceOver
Zoom Invert Colors
Speak Selection
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Only left side audio

Am only receiving left channel on sound playback, both headphones and internal speaker on G71-340US

Have you check for sound level on left channel....
To do that click start, in the search box type Sound. Once is show up in the search result, click on it.
Click on the default Audio Device and click properties
Now with the Speakers Properties window open, click on Levels tab and click Balance. Now check for the volume level on the Left Channel...
Although I am an HP employee, I am speaking for myself and not for HP.
Make it easier for other people to find solutions, by marking my answer with 'Accept as Solution', if it solves your problem.
Click on the BLUE KUDOS button on the left to say "Thanks"

Late2012, RMBP. Only left side of earphone works.

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