Sound not working after 10.9.4 Mavericks Update - HELP!

Same issue (no audio output/input device), same cause (10.9.4) same system (2012 Retina), same attempted solutions, no success. Given the 5-6 other threads I've found on this, it looks like a 10.9.4 problem.

Give this a shot:

sudo kextunload /System/Library/Extensions/AppleHDA.kext

sudo kextload /System/Library/Extensions/AppleHDA.kext

That restored Internal Speakers to the list of devices for me. Whether it survives or not, we'll have to see.

dru989,

You may also try this:

Close all windows and quit all applications.

Click "Go" menu in the Finder menubar.

Select Computer, then Macintosh HD > Library > Preferences

Open "Audio" folder.

Drag these 2 files to the desktop

com.apple.audio.DevicesSettings.plist

com.apple.audio.SystemSettings.plist

Close the window. Restart the computer.

Check Audio, if it works then trash the plists, if not you can replace them in the same location, you will have to enter your password. This will replace them and you will be back to square one.

I have a MBP Early 2011 and as soon as I updated to 10.9.4 and put the computer to sleep, once it woke up, no audio whatsoever (headphones or internal). I've reset the PRAM, SMC reset, Safeboot, both the fixes mentioned in this thread and nothing has worked. There is no doubt in my mind it is a 10.9.4 issue, does anybody have any other possible solutions?

There is sound in Netboot to a known good OS.

So I had the same problem; Actually other problems occurred after upgrade 10.9.2 (Thunderbolt related issues) and now after upgrading to 10.9.4 my internal sound disappeared.

The solutions described above made it worse; Sorry sykosoft .. but your solutions is even dangerous ;

I spend almost a Day finding out how to restore my internal audio devices ..

So what I discovered, this is a software issue;

Update on update on update without any clean install resulted in some filty .plist files

com.apple.audio.DevicesSettings.plist

com.apple.audio.SystemSettings.plist

looking in those files I discovered some settings pointing towards RabbitEars .. perhaps I tried it once in a previous life but now I do believe the upgrade took by incident the wrong 'device' as standard ..

So I looked up and the only thing I could do was finding .kext and other related stuff .. only able to remove it commando wise = terminal

after rebooting for the 722th time performing a SMC and PRAM for the 666th time the result was ... NO STANDARD devices detected 😟 😟 😟

THe only solution working is :

A recovery install;

https://www.apple.com/osx/recovery/

In my case I encountered a problem; My recovery failed (reboot press and hold CMD+R, selecting install fresh OS X)

I find out it was due to my FileVault encrypted HD; So first I uncrypted (switched off FileVault) my HD, and even created a USB recovery disk (not needed)

Tadaaaa 45 minutes later all problems solved, without loosing data or reinstalling all programs ..

*feeling relieved* I thought sharing my pain and solution would save you hours finding out how to repair, hoping PRAM and SMC reset would solve it ..

On a clean reinstall of 10.9.3, I had this happen maybe twice *after* installing the 10.9.4 (combo) update. I've never seen it before then. Both times, power cycling the MacBook (Pro, late 2011) cleared it up.

I wonder if a clean install of 10.9.4 would be any different.

Updated to OS X 10.9.4 on macbook pro 13 Early 2011

After update:

Sound/soundcard is missing - no audio in/out

Safari 'teares' and flickers with scrolling up and down, video black tearing flickering on web pages.

No solution yet, nothing worked so far.

these terminal command prompts worked for me

sudo kextunload /System/Library/Extensions/AppleHDA.kext

sudo kextload /System/Library/Extensions/AppleHDA.kext

when i ran the "kextunload" command i got an error saying "it was not found"

then ran the "kextload" command and it went through with no error

bing bang boom my sound is back up and running! =D

(Late 2011 15" MBP)

I had similar sound and application instability problems after both of the 10.9.3 and 10.9.4 version updates to my computer's operating system.

The problems correlate to system log entries such as "Refusing new kext com.apple.kpi.iokit, v13.3: already have loaded v13.2." (They are visible in the Console application or by searching the /var/log/system.log file.)

The underlying issue is that the Recovery Partition is full, or nearly full. To fix the sound and instability problems, I adapted some of the suggestions that I found at https://communities.vmware.com/message/2350702#2350702 and https://communities.vmware.com/message/2375949#2375949 to my situation.

I mounted the Recovery Partition, found the largest file therein, backed up that file, deleted the original file, and rebooted the computer. That allowed the newer versions of the kernel extensions to load and cache properly. After rebooting, I verified that the sound output was functioning correctly. Finally, I restored the large file from back up to the Recovery Partition, just in case it's needed in future. In my case, the large file is "BaseSystem.dmg".

The Recovery Partition can be mounted (and made visible in the Finder) using the command line in the Terminal application (if you happen to know the precise syntax) or using the Disk Utility (as explained at http://osxdaily.com/2011/09/23/view-mount-hidden-partitions-in-mac-os-x/).

Note: The kextunload and kextload command sequence mentioned in other posts worked only temporarily for me -- rebooting my computer would cause the sound to go out again. Also, the kextunload/kextload sequence did not address a bunch of other application instability issues. However, it did point me in the right direction, reminding me of kernel extension update issues.

Thank you!

kextload

~$ sudo kextunload /System/Library/Extensions/AppleHDA.kext Password: ~$ sudo kextload /System/Library/Extensions/AppleHDA.kext /System/Library/Extensions/AppleHDA.kext failed to load - (libkern/kext) link error; check the system/kernel logs for errors or try kextutil(8). ~$ sudo kextload /System/Library/Extensions/AppleHDA.kext ~$

My sound is now working!

Never mind, it only worked temporarily.

Like I said,

I tried everything;

ONLY SOLUTION (real solution no fixes or so) is a RECOVERY install;

In that case you won't lose any data, core structure of system is reinstalled,

besides audio problem, it also fixed my thunderbolt issues!

My advice: take 30 minutes performing a RECOVERY install

*simple as that*

Same here, no sound again after reboot. I reverted to an older version of the AppleHDA.kext from a Mavericks installation I had on another drive (one pulled from time machine should work too??) and this seems to have resolved the issue on my imac.

Thanks sky. Your solution worked for me.