I cannot hear any audio from my MacBook Pro, running OS X 10.7. Pressing F10/F11/F12 shows the volume overlay, but it stays at max volume with a (/) icon below it. In the Sound control panel or from the sound icon in the menu bar I can adjust the volume, but the Mute checkbox is greyed out. Rebooting does not resolve the problem.
The headphone jack had a red LED glowing inside, which clued me in that it thought there was an optical cable plugged in. Plugging and unplugging a pair of headphones resolved the problem.
I had same problem, but none of these suggestions helped.
I was almost desperate, since I found this interesting article: How to reset the audio system in OS X
So I begun to follow the steps suggested into the article. But I had to do a little more in order to restore audio capability. Here the steps I did:
$ ps -ef | grep audio 202 376 1 0 10:01AM ?? 0:00.86 /usr/sbin/coreaudiod 202 379 1 0 10:01AM ?? 0:00.04 com.apple.audio.DriverHelper 501 475 1 0 10:01AM ?? 0:00.02 com.apple.audio.SandboxHelper 501 528 504 0 10:02AM ttys000 0:00.00 grep audio $ sudo killall audio.DriverHelper $ sudo killall audio.SandboxHelper $ sudo killall coreaudiod
then open "Audio MIDI Setup" utility.
And then toggling settings such as these can reinitialize the audio driver.
Maybe this procedure will rewrite the audio configuration
What I did was keep my headphone jack plugged in while turning up the volume (F12). Then, while I was turning up the volume I pulled out the headphone jack. This fixed it.
It almost seems as if I tricked it. I read a few other posts where you do this in the volume audio panel but those solutions did not work for me.
The same thing happened to me but I found a solution and it should work. It's an easy solution so read carefully.
Turn off your MacBook.
When you turn on your MacBook a grey apple appears on the screen - before that grey apple appears press these keyboard buttons Command + Option + P + R (hold the keys at the same time).
Hold they keys until you hear the sound you usually hear when you turn on your MacBook the second time.
The MacBook should be fixed.
I have experience with the same issue and think it's Apple fault in how OS X handles the dual function of its audio output. My solution was to install Ubuntu, it doesn't mute it anymore.
Since using Ubuntu 13.04 now on my macbook pro early 2011, it never suffers from the infamous headphone jack problem. Removing the headphones, the internal speakers work, plug it in, the headphone works.
Here're some articles that explain what's up with the headphone jack, and the root cause of this behavior:
- Continuing issues (and solutions) for the MBP's silent speaker problem - 4/2012
- Getting Sound Back on a Macbook Pro (when the headphone is stuck on Optical) - 8/2012
- Apple's finicky headphone jacks frustrate MacBook owners - 2/2009
On OS X, it just doesn't work. If I dare plugging in the headphones, I know that when I take it out, internal speakers will stop working, they will be muted, and not come back after a while. I've stopped plugging stuff in and out trying to make it work.
I just installed a new OS that works. I suspect Ubuntu, maybe, just ignores all the stuff about the dual mode of the headphone jack.