You will need to use the device and possibly the jack you last used on the device output last used. In my case I used a Samsung Soundbar for a television set (testing it). Below are the steps that worked for me.
Step 1. Plug in device and jack last used that caused the issue.
Step 2. Play iTunes through the jack and device.
Step 3. Pause the sound.
Step 4. Launch System Preferences (make sure it was closed prior to step 1).
Step 5. Go to output tab.
Step 6a. Unplug the Jack and it will reset to internal speakers. (if not go to Step 6b)
Step 6b. While remaining on Output tab of system preferences, continue to plug and unplug the jack connected to the output device and it should reset itself after several attempts. You can always see the red indicator light as you insert in the jack and if the light is no longer present, you are successful and the output field will display the text Internal Speakers.
Look into the headphone jack - do you see a read light?
i think you just need to restart the computer plug and unplug the headphone if this not work than visit http://goo.gl/RRSF7r . i hope this may help . thanks
by FRANK SCOTT
Same case for me, in 2019 : my macbook pro 13" early 2013 has got this greyed out sound volume icon and all the solutions found on Internet and this thread did not work at all...
Has anyone solved this please?
I had the same thing happen. Here's the fix (at least for me several times): plug in a set of external headphones. Even earbuds with bluetooth is fine. Once your mack acknowledges the sound through this external device you can disconnect it and it goes back to normal working function again.
by Eric Colson
I had the same problem and I was desperately looking for a resolution but all I found was nothing useful , I do have the solution you just have to go in PATCH UPDATER , follow all the steps to patch your iMac,Mac book pro. When you see a pop up telling you restar the computer click on there and and wait for the computer to turn on ....And your Mac is ready to go .
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