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

Okay, I'm at the apple store and they replaced the speaker assembly, audio board, and audio board flex cable. It was in repair for over a week (from Monday 10/6 to Thursday 10/16). See my previous posts for the symptoms I had. I think the various posts relate to various problems. In my circumstance, it was a hardware, not software, problem. Look carefully at the differing facts in the differing posts.

I have the same issue with my MacBook Air also. It started today out of the blue. Both the speakers and headphones don't work, and the Sound System Preference doesn't show any output or input devices, although the System Profiler does show an Intel High Definition Audio item under the Audio (Built In) section.

I've also reset, tried booting in safe mode, and erased / reinstalled Leopard but no luck.

Same issue with me, more or less upon updating to iTunes 8, but also around same time as updating to 10.5.5. Discovered today (22 October 08). Everything I read above leads me to believe that this is a software issue. My exact situation:
1) no sound icon in the top menu bar
2) when I try to adjust audio with volume keys, I get international 'no' symbol at bottom of volume slider icon
3) in audio control panel, I get 'no output devices found'

Here's hoping Apple can cook up a patch soon. (Surely they use their own computers and will have had the same problem?)

Same problem as everyone here, I did some research on the Error code, its a low level problem with the firmware on the chip. I have had my board replaced and I land up with the same problem coming out of sleep mode, I have been able to fix it with Onyx clearing the cache's but sometimes it works and sometimes it doesn't, I am convinced it happens when writing or saving to the chip when coming out/in of sleep mode no fix that I can see...other than this Onyx things..anyone have any other tools that might be of use...

OK, so mine is the iBook G4, not the Air, but the issue does seem to be with notebooks (I also run two desk-tops: a six-year old iMac, and one I bought earlier this year both working fine). After restarting the iBook off of the system install CD and doing a couple of re-starts, my audio is back. I don't imagine that I have solved the problem (but maybe I'll be lucky), but this is further evidence that it's software, not hardware. For those of you for whom audio has failed, do you get the start-up tone? If so, surely this indicates that the hardware is working OK. If not, the problem could indeed be hardware or software, but this looks more and more like a notebook software issue.

I called Applecare about the no sound issue on my Air. The tech had me first take headphones and put them in and out of the headphone jack several times to see if that would do anything. It did not. She then suggested I take it to the local repair center. Before we hung up I restarted the Air and there was the startup chime and the sound icon was back. However, later that night the icon disappeared again. Over the next few days it has come and gone, usually on a restart but not always. I plan to check with Applecare again soon since I have a long-term protection plan.

I am using a 2.4GHz Macbook Pro and seem to have the same problem after updating a bunch of software including iTune yesterday.

The start up tone is working and when I boot up the computer from an earlier Carbon Cloned hard drive, sound works perfectly fine. So it's not a hardware issue, I am pretty sure.

Those in the know, please shed some light to help solve this problem, thanks.

I'm working IT and came across a Mac laptop with the problems described above.

No idea about getting the sound restored, but you can fix the YouTube/flash video problem by updating to the latest version of Flash:

http://labs.adobe.com/technologies/flashplayer10/

Was there a software update from Apple at the beginning of October that caused all of this?

I have the same problem, no sound, no sound icon, slow or non-working videos (youtube).

This seems to have occurred after iTunes 8 install.

Does anyone have the fix?

Stupid Apple. Their service simply *****. And I have the AppleCare.

I am having the exact same problems with videos along with my sound. Because they're all happenning at the same time do you think maybe it was a problem with an apple update? ... just a thought, im not great with comps

This continues to be a mystery. Audio on our Air has been on and off for a couple weeks now. The past 3 days there was no audio despite restarts, etc. This morning the computer was rebooted and -- tada -- the sound came back. No idea how long it will stay or why it came back this time.

Hello all,

Okay this is what I have got so far; no sound, no device (for sound), and videos stop playing.

I have a support plan. Apple had me reset the machine, and on the first time around I got sound. Then reboot again, and nothing.

I installed and ran OnyX, didn't help at all. I did a couple of other suggestions that other commenters wrote, no avail.

I did notice that when I went to Apples page, that I could play all of their video content, but no sound.

This only happened to me after I installed an update from Apple.

I have an appointment at the Genius bar (Apple support), and I will let you know what they did.

Good luck.

Yes, please let us know what the Genius Bar says/does. I will get sound every so often on a restart and then it will go away again either by itself or on the next restart. Doesn't seem to be any pattern.

I have this problem also. Safe boot and restart seems to cure it for a few hours then it comes back. This morning I was streaming Pandora on my MBA for 30 minutes and then all of a sudden no sound.

This has been going on since October and really is a pain.

We discovered something that may be coincidental or not. As mentioned earlier, every so often on a restart the sound will come back. After a while, the Safari browser will crash and the Air will have to be restarted at which point the sound is gone again. Coincidence? Also,earlier today, all of the icons at the top disappeared (not just the sound icon but also the battery indicator, the signal strength indicator, the time, etc.) but unlike the sound icon disappearing the other functions continued to operate (could still search the web even though there was no signal strength indicator). Coincidence? After a restart the icons came back -- but not the sound or the sound icon.