1 Reply Latest reply: Feb 3, 2013 3:02 PM by Unggoy Murderer
BexPearson Level 1 (0 points)

Having a mare.. There is no sound on my notebook. If I try and unmute (pressing the 'volume up' button), an the speaker icon comes up in grey with the 'no entry' symbol




MacBook Pro, iOS 6.0.1
  • Unggoy Murderer Level 1 (15 points)

    Is your MacBook plugged into an external audio device?


    If not, will most likely be a software issue. The quickest way to fix an software issue to copy a simple command into the Terminal and it will restart the "CoreAudio" portion of the operating system:


    To launch Terminal:


    > Click on the Finder icon on your Dock.

    > Click on Applications on the Sidebar.

    > Double click on the Utilities folder.

    > Double click on the Terminal icon.


    When Terminal launches, you will be presented with a white window.


    You need to copy and paste this command:


    sudo kill -9 `ps ax|grep 'coreaudio[a-z]' |awk '{print $1}'`


    You will be prompted to enter your password (no characters will appear when you're typing, this is normal behavior). Press enter when you have entered your password, and if it's correct, it will execute the command.


    Give the computer 30 seconds or so to restart the service (it won't look like it's doing anything, this is again normal). You'll know when it's complete if you can type into the Terminal again.


    Safely exit Terminal by going to Terminal in the Menu and clicking Quit Terminal.


    Then try unmutting your MacBook. If it works, awesome! If it doesn't, it might be a hardware or deeper software issue. You'll be best contacting Apple in that case. Contact Apple: Contact Us


    Hope it helps!


    - Callum


    (NOTE: improper use of the Terminal can damage your computer, please take extreme care to copy the above command EXACTLY as it appears. I take no responsibility for any damage that may be caused through improper use, you do so at your own risk. I tested the command above, again exactly as it appears, and it executes fine on my iMac with no issues)