MacBook Air no audio output device found ???????? *please help*

Yes, unlikely as it semed, this solved this problem on a 2007 (I bought it because they last a long time) imac. I cannot be absolutely certain of the trigger which caused the loss of sound output but the problem certainly arose at about the time I upgraded the operating system to Mountain Lion. Internal speakers continued to work ok.

I used headphones and for what is worth I plugged and unplugged them a couple of times and then (this seemed to be the important bit) adjusted the volume in the system preferences and the sound returned after what has been several weeks without use of a Bose speaker system.

Thankyou rynelandt.

Fixed!

I first tried every solution in this thread, with no success. I reset the PRAM, fixed file permissions (disk utility), rebooted multiple times, plugged in USB-headset, plugged in minijack, and even tried to install the latest combo update (which for some reason fails). The sound device was missing also when i booted into safe mode.

However, I did manage to fix the problem by booting into recovery mode (hold cmd+r while booting), and then simply reinstalling OS X. This doesn't erase or change any user content, so everything will be just as before when the installation is finished. (But as always - do have a backup just in case!) It just reinstalls the system files. And, the sound device problem was fixed. Yay!

Yes! 1000 times yes! Apple told me I was going to need a new logic board but that sounded like a heap. If you have the problem with the greyed out volume and no inputs, don't pay Apple a dime until you try the trick in this video. Just move the audio cable from under the battery to the top of the battery. Pure effin magic.

Exactly the same to me. No sound, no source. 1st gen MBA, 80 GB.

I tried everything. The SMC. Reinstallation of SL, plugging and unplugging headphones, deleting plist, repair permissions, toying with settings, zap PRAM. Nada. Nothing.

I suspect it's the cable, probably because of overheating placement under the battery, poor design with folding ribbon cable.

Then the hinge broke... Apple is no longer standing behind that problem.

I've stood behind Apple since day one. I have a bushel basket of their products.

We are all getting rotten Apples!!!!

I had the same problem no sound I tried resetting holding command option and P,R it would work for an hour then be gone again.

Then I tried holding command and D down while I restarted my computer the whole way through the restart and shazam it worked and I still have the sound for a full day now.

Fingers Crossed

Headphones in and out and in and out. Do this until you see in system Preferences / Sound that Digital Output changes to Internal Speakers.

Such an old problem, but stil existing in the latest OS X releases.

(And I hate the situation when I really need my internal speakers and there is no headphones around me to be found)

Civix74 was right. I spent 2 hours reinstall OS X last night. After it was done, my mba restarted twice still no speaker. I gave up, went to bed. This morning when I turned on my mba the magical chime came with the boot screen! I turned it off during lunch, and turned it on again. Again the heavenly chime came out from the speaker. It's fixed! Halleluya!

I'm having the same problem, tried the PRAM reset but that just seems to be a temporary fix, so i ended up taking it to the genius bar and getting the logic board replaced. Then a month later to the date, it started happening again. So now i'm at a loss of what to do.

I started experiencing the "No audio output device" issue out of the blue about a week ago and had not made any OS upgrades, installed new programs or damaged my MBA in any way. I tried all the other recommendations listed but they all failed after a few moments and I was soundless again. Changing the placement of the audio cable as outlined in this video worked perfectly and I have not had further issues.

I will update if the issue reemerges.

Took my macbook to the apple store a few times with this issue, first had the logic board replaced, then the flex cable, third time i took it for repair they replaced the I/O board. The sound seems to be back now and havent had any issues since.

After loosing sound again, I placed the audio cable back in the original "under-the-battery" position and I have reliably had sound for two weeks. This definitely seems to be more on the hardware side (at least in my case) but I so far have been able to repair it without replacing any parts or even spending a dime.

i also tried rebooting, plugging in and out, SMU reset, PRAM reset, repair permissions, deleting ~/Library/Preferences/com.apple.BezelServices.plist ...no joy.

finally stumbled on this one:

Macintosh:~ user$ sudo kextunload /System/Library/Extensions/AppleHDA.kext

Password:

Macintosh:~ user$ sudo kextload /System/Library/Extensions/AppleHDA.kext

and voila!

Macintosh:~ user$ sudo kextunload /System/Library/Extensions/AppleHDA.kext

Password:

Macintosh:~ user$ sudo kextload /System/Library/Extensions/AppleHDA.kext

Worked for me! (At least so far). Thanks!

A few notes:

1. I had a headphone plugged in while trying this fix, but I'm not sure if the headphones had any effect on fixing.

2. sudo kextunload /System/Library/Extensions/AppleHDA.kext gave me an error that the file didn't exist. But I just continued with the second command anyway (sudo kextload /System/Library/Extensions/AppleHDA.kext), which worked fine. Then I input the first command again, then the second one. No errors this time.

3. I then rebooted and got the startup chime, and my audio is back.

Hi folks, maybe I have some things to add to this discussion, but no permanent fixes yet.

I've had similar problems getting sound from internal speakers on my MacBook Air, OS Mavericks. Upon startup one day, I suddenly had no sound. Here is a list of what happened. It’s weird. Sort of a hodgepodge of the symptoms and fixes I've read about so far.

1. At first, the volume buttons on the keyboard would cause the transparent image with the white blocks and speaker emblem to appear, but this would lag horribly (sometimes up to 10 or 15 seconds after pressing the buttons), and they still weren't making the characteristic mac "pop" that you're used to when you turn the volume up and down.

2. After checking System Preferences/ Sound and toggling the buttons a few more times, the volume icon at the top of the desktop went gray, the "internal speakers" option in the sound preferences pane disappeared and read "no output device found" or something like that, and of course I still had no sound.

3. I tried rebooting, but this changed nothing.

4. I tried plugging headphones in and out a few times, but this changed nothing.

5. I tried repairing permissions in the disk utility, but this changed nothing.

6. I tried playing sound a number of ways including through iTunes, youtube, and Reason, but this did nothing. Interestingly, when I pressed space bar on some .wav files to “preview” them in finder, they would not play. That is, not just no sound, they also did not play in the reel even though I pressed the “play” button.

7. I tried deleting the file Library/Preferences/com.apple.BezelServices.plist, but this did nothing.

8. I tried deleting the files Library/Preferences/Audio/com.apple.audio.DeviceSettings.plist and ./com.apple.audio.SystemSettings.plist, but this did nothing.

9. I tried logging in as a different user, which took me back to the situation described in 1., but still no sound.

10. I tried restarting in safe mode, which seemed to do nothing, but then when I restarted in normal mode everything was fixed!!! I had sound, and “internal speakers” was selected in the Sound preference pane. But this only worked for about 10 minutes, and everything went back to how I described it in 2.

11. I tried a bit of prodding in the headphone jack with a toothpick, but nothing.

12. I tried deleting the file Library/Preferences/com.apple.audio.AudioMIDISetup.plist, and this brought the sound back!!! But as soon as I tried “previewing” .wav files in finder as before, the situation described in 1 came back. Now it’s laggy volume buttons and no sound.

13. Upon rebooting in safe mode and rebooting in normal mode, I’m in situation 2 with the grayed out volume control at the top of the desktop, the circle with the slash through it when the transparent sound thing pops up, “no output devices found” in the sound preference pane, and of course no sound.

14. Tried wiping the PRAM with control + option + p + r at startup, and this worked!!! Sound is back!!! Until… yeah, of course, I tried “previewing” some audio files with space bar in finder and I’m back to situation 1 with the laggy volume buttons and no sound output. This time I tried previewing .m4a files in finder rather than the pesky .wav files I had tried before, just in case there was an issue with file type or the .wav’s were corrupted.

Anyway, I’m at a loss. I think for round 15 I’ll try dancing, chanting, and burning incense, or maybe I'll just order a beer. Unless someone has an idea, I’m headed to the genius bar when I get home.

The latest:

15. Turn off your laptop and leave it charging somewhere. Order a beer, sit on the beach for a couple of hours, pet a cat, listen to In A Silent Way, schedule a Thai massage, and change 1000 THB for smaller bills so you can tip the masseuse later. Then fire up your laptop, and the sound will work. So far it isn't reverting back to no sound when I try playing audio files, either. Crossing my fingers...