Previous 1 2 3 Next 41 Replies Latest reply: Oct 8, 2015 9:15 PM by dcsos
miguel valente Level 1 (0 points)
Hi there,

Since my last software update i've been experiencing some sound problems.
The sound keeps going on and off constantly and in my preferences panel the sound output device keeps switching from internal speakers to digital out and headphones by itself.
I've tried to get a solution on the internet but I can't find any solutions.
Very important: this is not the same problem that the microswitch of the digital out. In my computer the sound output doesn't stay in one device, so I believe that this is a software problem.
Can anyone help me with this . It is kind of annoying to have the sound going on and off all the time.

imac 21'' intel core 2 duo, Mac OS X (10.6.6)
  • CraigFortune Level 1 (0 points)
    Pretty much same problem here. It is driving me crazy! I get the sound device swapping from my usb headset to the speakers.

    Did you ever fix it? Anyone else experiencing it?
  • chester4444 Level 1 (5 points)
    Me too! I have Airphones app and my macbook keeps switching to it automatically. Its annoying!
  • CraigFortune Level 1 (0 points)
    Hopefully this thread will pickup and get noticed by Apple then. (before I get sectioned :D)
  • sonyasings Level 1 (0 points)
    My new iMac does the same thing. Sure would be nice if someone from APPLE would jump in here and let us know whats up. It is very very annoying!
  • Kenneth Hjulstrom Level 2 (440 points)

    I had a similar problem a few years ago with my PowerBook G4, and I fixed it by connecting my external speakers and disconnecting them a few times, figuring that maybe some conductive dust got into the port and was periodically making contact, causing OS X to think that I had speakers connected when I really didn't. Perhaps this might work to solve your problem as well.

  • CraigFortune Level 1 (0 points)
    I have a sneaking suspicion that you may have simply had the optical "catch" inside the jack stuck - Happened on my MacBook Pro once. (Did the G4s have optical audio at all? I wasn't using Macs back then)
  • Thiago Goyos Level 1 (0 points)
    Similar problem here with my iMac. I have a external mixer connected to my iMac via USB. Every time I restart my OS X (10.6.7 here) sound input/output changes to my external USB device, and I have to change it back to internal speaker/mic. I can't never leave like that...changes by itself on each restart... I have repaired OS X disk permissions couple of times and deleted /Library/Preferences/Audio/*.plist, /Library/Preferences/ and /Users/<MYUSER>/Library/Preferences/ but still the same. Any idea? Thanks!
  • OnTheUp Level 1 (0 points)

    My iMac does the same. I have never had anything connected to the external jack. It is nothing to do with the jack switch. It cuts in and out at random. The preferences switches from showing the only output as "Internal Speakers" to showing the only output as "Digital Out". When I try to change the volume it shows the volume popover with a 0 with a diagonal bar to indicate there are no volume controls.


    Today there was no sound for about an hour when I got up, then it just started to play then after 10 mins it cut out again. Since then it has cut in and out several times. Tried PRAM reset and all that stuff. No help. Problem is getting worse. Now I can't do any chats (iChat, Skype, etc) from my imac which means I may have to move off of it for work all together.


    Come on Apple, this is a real problem and I'm guessing it is a software issue.

  • CraigFortune Level 1 (0 points)

    Bumping this as I'm still suffering from the issue!

  • Santtu Järvi Level 1 (5 points)

    I have exactly the same issue. Both iMac and MacMini started showing these problems few weeks back. About 6 months ago I had this same issue and took the iMac to AppleCare.. one cable was replaced but it didn't help. Just as I was about to send the iMac back it suddenly started to work.

  • Santtu Järvi Level 1 (5 points)

    Update on the situation,


    I got the problem fixed (at least for now) by using toothpick to clean/scrape the socket walls. It is a bit weird that it worked since I have used speakers since day one so there can't be any dust there.

  • Thiago Goyos Level 1 (0 points)

    After lots of restores and fresh installs, nothing... same behavior. Fixed yesterday, just after upgrade to lion... still working good after one day...

  • timotrocks Level 1 (0 points)

    Same for me! This has still not gone away and its really irritating because the switching of the audio devices really lags out my macbook pro... D:

  • THBofSF Level 1 (0 points)

    This JUST happened to me (sound output swithing from speakers to headphones and then back and forth) while watching a You Tube video, at the same time my iPod popped up telling me I had recently purchased songs from iTunes and I could set it up to sync.


    The iPod wasn't connected to my iMac, so I opened the Bluetooth control panel, and it was paired with my iPod which I hadn't done. I use a wired keyboard and mouse so I just shut Bluetooth down. Twenty minutes on now and no issues.


    This is on a late 2009 27" iMac running a fresh CLEAN install of Lion pathced to 10.7.1 and an iPod touch that I just updated maybe 2 days ago. I'll update this post if it flakes out again.

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