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I have 13" MacBook Pro (Late 2009) model that is refusing to play sound on the right audio-channel.

Without any speakers connected it still plays fine but once I connect earbuds or a headphone, I only have sound in my left ear. In my right ear I hear a very low white noise sound.

I've tried rebooting, fixing disk permissions (very long shot, I know), same problem if I play sound in a virtual windows machine. And off course I've verified that the sound balance is set to both left and right.

I've "looked" into the mini-jack output but can't see anything wrong with it...

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6 Answers

up vote 1 down vote accepted

It is probably some dirt in- or another problem with your sound-output jack.

If twisting your headphone-cable or repeatedly plugging it in and out of your MacBook does not work, you might fix it by doing something like (gently!) poking into it with the backside of a matchstick or trying to clean it with some cotton buds. In that case make sure you have one that does not fall apart easily or you'll end up with a cotton-filled connector.

If that does not work, I'm not sure if you are able to fix it yourself since your MB might need to be taken apart to get into the jack and clean it…

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I suggest using compressed air rather than wedging anything in. Compressed Air is available at Tech Stores like Best Buy and Radio Shack. –  David DelMonte Aug 4 '12 at 3:22
    
Blowing compressed air in it didn't help either, ended up taking it to my local Apple dealer and they had to replace the motherboard. –  Jannemans Aug 6 '12 at 13:16
    
How much did that cost? –  Toby Sep 27 '12 at 7:13
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This is also a long shot, but check under System Preferences -> Universal Access -> Hearing and see if "Play stereo audio as mono" is checked.

Hearing properties

One other possibility: plug your headphones in and run Audio MIDI Setup (it's in Applications/Utilities). See if one of the output channels is turned down or muted. Be sure your headphones are plugged in because OS X has separate settings for headphones and built-in speakers and switches between them automatically.

Audio MIDI Setup screenshot

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Check your settings in System Preferences > Sound > Output.

I had the same problem and for some mysterious reason my left-right balance was completely screwed up.

No idea how it happened but once I adjusted it to center it now plays back perfectly (:

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+1 me too - same here –  stuffe Sep 27 '12 at 7:49
    
Yup .. this was the problem for me too. It does not help that this seems to affect only the earphones/headphones and not the MBP speakers. –  Ashutosh Jindal Apr 28 '13 at 14:30
    
Hmm .. I figured out that this happened because I had Boom installed to boost the MBP volume, and in System Preferences -> Sound -> Output, it was for 'BoomDevice' that the balance was askew. –  Ashutosh Jindal Apr 28 '13 at 14:32
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If you find that the headphone channel is blown, a workaround I have used is something like this: Sound Blaster X-Fi Go! Pro

These types of devices use USB rather than your headphone port. They also produce great sound.. Several companies make these kinds of products and they are fairly cheap.

Hope this helps

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Have you tried other headphones? It could be caused by a bad cable.

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Thought I would answer here as I had the same thing on my old macbook and now on my new one.

And it happened all of a sudden.

Looks like my sennheiser headphones somehow sets the balance to left after pulling the headphones out.

Go to sound settings and set the balance to the middle, assuming its on the left.

Otherwise hardware issue, which I doubt.

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