793      iPhone_iPad_Mac_apple

"No ouput device found" after Sierra update

  I updated my iMac (model 14,2) from OS X El Capitan to macOS Sierra yesterday. The update went smoothly except that once the update finished, the desktop loaded and I logged in the volume icon in the menu bar was greyed out. I immediately opened settings, assuming the update had somehow deselected my default audio-out device (a pair of external speakers in this case). However when I went to the sound menu I was surprised to see "No output device found".

  I've looked around quite a bit and haven't found anyone else with this issue yet. I became so desperate to get my audio back that I even tried installing the 3rd party "Voodoo" audio driver, however this only gave me the option for "Digital-out (HDMI)" which is of no use to me, I have the mac connected to a TV via a VGA adapter and don't own an HDMI adapter. One thing this did clarify however is that somehow during the upgrade my AppleHDA driver got deleted and never replaced, or installing an 3rd party driver wouldn't have added any output devices to the list (albeit greyed out and entirely dysfunctional ones). So at this point I am at a loss, I don't know how to replace the driver, nor where or how I would install it so any help is greatly appreciated. Danke!

Hello, I had this problem and after days of searching found a few things.  First ... there seems to be an issue with the HDMI port that now affects sound and can be different of course with each computer.  when I read this I played a song in iTunes ( no sound of course) then pulled out the HDMI cable ( which was connected to my monitor which has NO speakers ) As I pulled out the cable the sound came back for a second then disappeared.  The same happened in reverse when i put the cable back in, sound while I was pushing the cable in then nothing once completely in place.

So I tried something that had been mentioned in yet another post and it worked.

For others with the same problem....

Go to -- Applications / Utilities / Audio Midi Set up.

Select the output e.g. built-in Output

Look at format options, mine were set to 2ch  24-bit 44.0 kHz

I changed it to lower, as in the post I read, but that didn't help so I changed it to 2ch 24-bit 48.0 kHz

I also changed the HDMI to 2ch 16-bit 44.1 kHz

Eurika....... I have sound

The settings may be different for each computer so think you need to play around a little first.  For example a response to my post on this said all they had to change was the HDMI to the same settings I put here and it worked.  Good luck!

What is NVRAM?

A small amount of your computer’s memory, called “non-volatile random-access memory” or NVRAM, stores certain settings in a location that OS X can access quickly. The settings that are stored in NVRAM depend on the type of Mac you're using, and the types of devices connected to it.
Information stored in NVRAM can include:
Speaker volume
Screen resolution
Startup disk selection
Recent kernel panic information, if any
If you experience issues related to these features, you might need to reset the NVRAM on your computer. For example, if your Mac starts up from a startup disk other than the one you've specified in Startup Disk preferences, or if a question mark icon appears briefly when your Mac starts up.

  Thanks for your reply, this seems to have partially fixed my issue, after the NVRAM reset I proceeded to reboot, and the external speaker made a popping sound. The external speaker was finally in the list of audio output devices, however a soft static sound continually plays from the speakers at all times, and turning down the external volume knob makes no difference. On top of that Whether or not the speakers work on boot seems to be random, some cold boots it works fine, others it doesn't. Some reboots it works fine, other times it doesn't. Even when rebooting to the macOS partition from my Windows partition delivers inconsistent results. Finally, and this last issue may be a problem wit the microphone I was using, but I tried to connect an external microphone to test out Siri when the audio first started working, and when I spoke into it everything I said was echoed through the speakers rather than picked up by Siri. I never had any of these issues with El Capitan, Mavericks, or Snow Leopard (yes, I did jump straight from Snow Leopard to Mavericks ) and the upgrade went smoothly so I am rather confused.

I had a similar issue, just with sound being very quiet after the update, no matter what output i used. NVRAM reset seems to have fixed the issue.

Hello, I had this problem and after days of searching found a few things.  First ... there seems to be an issue with the HDMI port that now affects sound and can be different of course with each computer.  when I read this I played a song in iTunes ( no sound of course) then pulled out the HDMI cable ( which was connected to my monitor which has NO speakers ) As I pulled out the cable the sound came back for a second then disappeared.  The same happened in reverse when i put the cable back in, sound while I was pushing the cable in then nothing once completely in place.

So I tried something that had been mentioned in yet another post and it worked.

For others with the same problem....

Go to -- Applications / Utilities / Audio Midi Set up.

Select the output e.g. built-in Output

Look at format options, mine were set to 2ch  24-bit 44.0 kHz

I changed it to lower, as in the post I read, but that didn't help so I changed it to 2ch 24-bit 48.0 kHz

I also changed the HDMI to 2ch 16-bit 44.1 kHz

Eurika....... I have sound

The settings may be different for each computer so think you need to play around a little first.  For example a response to my post on this said all they had to change was the HDMI to the same settings I put here and it worked.  Good luck!

Thank you! This seems to have completely fixed the issue. I am still dealing with the odd soft static sound from all output devices (which has made headphones unusable), however the main speaker and external speakers no longer inconsistently refuse to initiate on boot or when resuming from sleep, and on them the static is subtle enough that I can still use them. ^This seems to be the proper solution if audio refuses to consistently work.

I went to the Audio Midi Setup and i had no options availble select.

So now what other solutions are there?

hello,

Same problem with external speakers connected through a wire.

All I can hear is internal speaker, and the external speakers do not appear as option.

I tried going to midi and changing to 2ch 24-bit 48.0 kHz - and a few other options.

did not work.

With apple on the phone, we did the NVRAM reset, then re-installed Sierra. Still no result.

I went to the store and they showed me that the earphones work (I didn't have the speakers with me, cause I move around on a bike).

Obviously there's a problem with Sierra not recognizing the hardware.

Apple techs don't seem to know the solution.

The speakers work fine with older OS.

Any ideas on what to do?

And how do you change the HDMI to 2ch 16-bit 44.1 kHz

thanks

mary ellen

Did you find a solution for that? I'm currently having this problem.

I have not yet found the solution. I need to go to the Apple store with my speakers. Someone at a local computer store told me I had to install 'pilotes', but I could not find any pertinent information, it's written that they come with the new operating system (integrated). The internal speaker is quite useless, meanwhile. Thank god my Bose bluetooth speaker works for my laptop.

Just ran into this issue with High Sierra DP9 - and you're idea worked.  I first changed it to 48 kHz 2ch 24-bit, which worked, but than I changed it back to 44.1 kHz and everything has continued to work.  This is definitely one of the more bizarre issues I've come across.

最後更新：2017-09-04 17:29:43

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