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Downloaded Yosemite and lost sound

No sound to internal of external speakers after downloading Yosemite. Anyone else have this issue?

Posted on Oct 17, 2014 3:35 PM

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31 replies

Oct 18, 2014 10:06 AM in response to stevenmk

Ran into the same installation bug with my 2009 iMac. No sound, and when I could get the Sound pref pane to open, no input or outputs were there. Did a power reset and zapped the PRAM, no joy. Did as I always do with new Apple OS installers, created a bootable USB drive, and attempted to re-install it all again. Same result.


What finally worked, and I wish I'd have followed this basic step before I had to resort to these re-installations, was detaching everything from my iMac. USB and Firewire drives (the latter performing my TimeMachine back ups), booting from the USB Yosemite drive and installing once more to the iMac's internal hard drive. Upon restart…sound. Finally. Checking my Sound pref pane, all inputs and outputs restored!


Whew! The only issue left has to do with the Microsoft Wireless keyboard (6000 v3) using Bluetooth. Both its volume up and volume down keys only decrease sound volume. I can live with that, if need be. Hope this helps.

Nov 18, 2014 11:35 AM in response to j-m-d

After the recent 10.10.1 update:


Still not sound, so tried the following...


In terminal: <sudo killall coreaudiod> restored the sound temporarily, after a reboot, no sound


Run: <sudo killall coreaudiod> again and then repaired the permissions, reboot, still faulty.


Reset the PRAM, still the same.


Run: <sudo killall coreaudiod> again, then shut down.


Started in Safe Mode, no sound.


Rebooted, sound has been restored ever since - hope things continue...

Nov 18, 2014 12:01 PM in response to stevenmk

In another thread about sound issues, I saw a fix, which worked for me:

plug in headphones, unplug, and then you should be able to select your external speakers.

I have ancient & beloved HK Sound sticks +iSub, using USB, and go through the same sound problem

with every incarnation of Mac OS X. The sound issues have been sorted, in the past by revision 1 or 2.

Don't loose hope!

Rumor has it that first revision comes out today with 10.10.1.


Good Luck!

Nov 18, 2014 12:19 PM in response to stevenmk

Sound – can’t hear sound from speaker - Yosemite


Sound – No Sound After Upgrade (2)


Sound Levels - Troubleshoot


Sound – Troubleshooting Internal Speakers

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Downloaded Yosemite and lost sound

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