headphone jack is only emitting right sound.

This helped me, but i haven't touched anything about sound before.

Mac computers really started to annoy me these days.

This happened to me after about 4 months of owning my Retina MBP. The Apple store confirmed it was a faulty audio port, and had to replace my entire logic board to fix it. Perhaps you will have the same results as me.

what a rookie error ! thanks for pointing that out, although for what it's worth I know that I didn't ever change that setting. I wonder whether I inadvertantly hit a certain key combination though

Happened the same to me! I don't understand how it randomly changed the balance...

Thank you for posting it! It really helped!

It worked, thank you!

I have the same problem mid 2012 13" macpro, tried all the things mentioned on this thread, nothing helped me...😟

Haha yes! I thought my port might have been broken too, and then saw this post. I didn't think i was stupid enough to let this happen, but im assuming it just randomally changed. Anyways, it worked!

Thanks!

my bad .. i dint notice it .. thanx brah 😎

This happens to me all the time. I'm constantly having to re-Balance my Headphone Output to the Center. It's moving on its own somehow. What's the **** is going on?!?!

Macbook did this this morning. Followed your steps - worked perfectly. Thanks! (Why it decided to randomly lower my left earphone overnight between last shutdown and morning startup I have no idea...)

And how did you handle that? I did apparantly the same thing last weekend: connected a projector last weekend and since then I do not have any sound on my left headphone speaker. Restarting, resetting vpram, checking audio balances. All those "tricks" did not help.

Go to the Audiodrome post dated 17 Nov 2012 on the first page of this thread. Follow the instructions exactly.

Myself and a number of others had success with this for what appears to be exactly the same problem that you have, although in my case it was the right output that was attenuated, not the left as seems to be the case with you.

If that fails it looks like a visit to the Genius Bar will be needed.

K

I'm having the same problem. I tried all the steps listed on the 17 Nov 2012 post but the results are completely random.

It's my right (secondary) speaker not working. I thought it was to do with the speakers so went ahead and bought a new pair of speakers, just set them up and still not working.

When I click on the left and right, sometimes, I'm getting a white noise on the speaker that is working, sometimes I'm getting nothing at all.

Re: the speaker that is working, most of the time, I'm getting a faint pop - once, I got a shred of white noise but it could hardly be heard.

Tried instead hooking the speakers up to my MacBook, which I have had since June 2012, and working fine...

Do you think that this is a hardware issue? My mac is a 3.06 GHz Intel Core 2 Duo iMac with 4 GB 1067 MHz RAM, purchased on 01/01/2010. I'm currently on System 10.9.1.

Thanks,

Rory

Why won't it let me submit my post?

Right, well no one else seems to be having the same problem... so resorting to playing my music via home sharing on my MacBook instead... except that doesn't seem to be working either (see separate thread) I can't win!

I have sat here for the last hour and a half trying to get home sharing to work.

I'm just going to do a Repair Disk Permissions and hope that works, seems to have solved everything in the past...

at what point did mac go so far down hill? Even the spotlight doesn't work... (Thinking of converting to windows)