Yosemite sound out problematic, unless I run "sudo killall coreaudiod" each time after I start up.

I'm running OS X 10.10.5 on an end 2013 27 "iMac 3.5 GHz with 32 GB of RAM.

I have no idea what caused it, but start within the last week, OS X has problem when switching between audio output devices. Sometimes I use output built-in, and sometimes I use one of the two audio devices USB different. But even when I manually pass the output device, either from the right or in the preferences system-noise menu bar, it does not always correctly UNLESS I run the terminal command "sudo killall coreaudiod" after which it immediately works perfectly again... until my next reboot.

Yes, a fresh user account works FINE. It is only my user account that I used since I have this computer that has this problem. I know that I could create a fresh user and migrate files to the new user all my life, but I really don't want to do that, unless it is absolutely necessary. Something almost a year ago caused this problem, and the migration to a new user was the only solution. I don't want to do that again if possible to avoid for many reasons.

I want to do is ask - someone ' one know a way to solve this without having to always run "sudo killall coreaudiod" whenever I start?

I tried just about everything I can think of without success. I have:

-Fixed the permissions normally, while the boot without failure and during the recovery Partition boot

-Reset the PRAM/NVRAM and SMC

-trashed Macintosh HD/Library/Preferences/Audio/com.apple.audio.DeviceSettings.plist

-trashed Macintosh HD/Library/Preferences/Audio/com.apple.audio.SystemSettings.plist

-trashed Macintosh HD/Library/Preferences/com.apple.audio.AggregateDevices.plist

-trashed Macintosh HD/Library/Preferences/com.apple.systemprefs.plist

-trashed Macintosh HD/System/LaunchDaemons/com.apple.audio.coreaudiod.plist

-trashed MyUser/Library/Preferences/com.apple.audio.AudioMIDISetup.plist

-trashed MyUser/Library/Preferences/com.apple.audio.InfoHelper.plist

There are probably other prefs that I've trashed, I don't remember right now.

Because a fresh user does not have the problem, I really feel like the problem MUST be somewhere in my user folder library. Perhaps a cache or a preference that I have not thought. I wonder if just a reinstall of the OS X Yosemite (while keeping my user intact and NOT completely clear) would help.

Can anyone help? I don't want to deal with the migration of my user and I don't want to have to run "sudio killall coreaudiod" whenever I start.

Thanks to all those who can help you.

I FIXED IT! And remember that this is how I fixed it last year, too. Apparently an update of my software Native Instruments, a couple of weeks ago secretly put NIHardwareAgent in my list of connection.

NIHardwareAgent out of my login items and restart completely solved the problem.

So happy. I hope this can help someone else that I couldn't find this answer anywhere online and of course could not remember how I fixed when this happened last year.

Tags: Mac

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