My macbook sound isn't working! Help please!

Discussion in 'MacBook Pro' started by randomuser1, Dec 12, 2011.

  1. macrumors newbie

    Dec 12, 2011
    Hi! My Macbook Pro's sound suddenly stopped working earlier today. I was on YouTube and the sound was working perfectly fine, but when I went to another video the sound stopped working. I thought it may have just been the video itself so I clicked on another video. Again, no sound. I unplugged my ear buds and turned the volume up. No sound. I went to iTunes and tried to play some music. No sound. I thought that maybe my computer was too outdated so I did a software update and restarted my computer a few times. Each time I restarted the welcome sound DID appear. I don't know what's wrong! Does anybody know what's wrong and what I can do to fix it? That would be great. Thanks. :)
  2. macrumors Westmere


    May 16, 2008
  3. macrumors 6502

    Jun 13, 2007
    Nottingham, UK
    I've regularly had to do a...

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

    ... in the terminal after watching YouTube videos under Lion because the entire audio subsystem fails.

    A reboot works just as well, of course, but is significantly more distruptive.

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