Update of the "couldn't find any output device" after the Sierra

I've updated my iMac (model 14.2) of OS X El Capitan with macOS Sierra yesterday. The update went smoothly except that once the complete update, the Office and I logged the volume in the menu bar icon is grayed out. I immediately opened settings, assuming that the update had deselected somehow my default audio output device (a pair of external speakers, in this case). But when I went on the audio menu, I was surprised to see "not found any output device.

I have looked around a bit and have not yet found anyone else with this problem. I became so desperate to get my audio that I even tried installing 3rd party 'Voodoo' audio driver, but it 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 it does not have a HDMI adapter. One thing it stated however is that somehow during my got deleted and never replaced Applehda driver upgrade, or install a driver on 3rd wouldn't have added of output devices to list (albeit dimmed those outside and totally dysfunctional). So at this point, that I am at a loss, I know not how to replace the driver, where or how I would install it so any help is greatly appreciated. Danke!

Hi Alison E.C..

Thanks for the upgrade to Mac OS Sierra! I see that you have lost your audio output device once you upgrade. No worries. Great way to try to get your audio works using another audio driver. Given that this has not solved the problem, please try to reset the NVRAM.

What is NVRAM?

A small amount of memory on your computer called "non-volatile random - access memory" or NVRAM, stores certain settings in a location that OS X can access quickly. Settings that are stored in NVRAM are dependent on the type of Mac you use and the types of devices on it.
Information stored in the NVRAM may include:
The speaker volume
Screen resolution
Selection of boot drive
These latest panic the kernel, if applicable
If you encounter problems with these features, you may need to reset the NVRAM on your computer. For example, if your Mac starts up from a bootdisk other than that specified in startup disk preferences, or a question mark icon appears briefly at the start of your Mac.

How to reset the NVRAM on your Mac.

This should have your internal audio device showing as it should be under your settings in the system preferences. Please use the Apple Support communities to post your question.

Have a great day.

Tags: Mac OS & System Software

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