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Audio & Sound Not Working in Mac OS X? It’s an Easy Fix
https://osxdaily.com/2015/03/01/no-audio-sound-output-mac-fix/
no sound, and my built in speaker missing ... - Apple
https://discussions.apple.com/thread/7969092
He solved the problem by restarting in Safe Mode. You can try the same. Hold down the Shift key while starting your mac. Note: Safe Mode is slow. That is normal. After restarting in Safe Mode, test to see if your speakers and microphone are back, then restart normally. Reply Helpful (1) wabb1t Level 1 (14 points) Notebooks
How To Fix OS X El Capitan Sound Not Working Problem
https://www.techjunkie.com/how-to-fix-os-x-el-capitan-sound-not-working-problem/
Go to System Preferences-> sound and put the tick on “Show volume in menu bar” Change Internal Speakers Settings Go to Settings -> Audio -> Output. Changing the settings for internal speaker. Use a Bootable USB Drive Backup computer. Create bootable El Capitan USB drive. Install El Capitan in your Mac internal hard drive using bootable USB drive.
help: built-in audio sound driver missing - Mac Support
https://macosx.com/threads/help-built-in-audio-sound-driver-missing.41099/
I repaired permissions just now. I see no built-in audio drivers at all in System Preferences/Sound. I have tried reinstalling OS X from my cds and it does not see my hard drive on the laptop. I think I made a mess when I started trying to copy my program preferences from my home iMac to my laptop
No Output Audio Devices Suddenly on your Apple MacBook ...
https://www.hightechdad.com/2011/02/10/no-output-audio-devices-suddenly-on-your-apple-macbook-macbook-pro-or-macbook-air-try-these-7-fixes/
Go to the Apple site and download the latest Combo Update for your version of OS X. And be sure to Repair Permissions after installing the combo update. Start in Safe Mode– try booting in “Safe Mode” by holding down the Shift key when starting up. Check to see if the audio is working after that.
Troubleshooting Connection Issues on OS X and macOS ...
https://support.serato.com/hc/en-us/articles/360000064936-Troubleshooting-Connection-Issues-on-OS-X-and-macOS
Connect your controller Open Audio MIDI Setup > Window > Show Audio Devices You should see Built-in Microphone and Built-in Output. [Ctrl]+ [Click] on these, and ensure that they're selected for Sound Input, Sound Output, and Sound Effects. This will mean that your controller will be free to accept audio from Serato DJ. Reset the MIDI connection
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