Clicking the volume keys or the mute button did nothing, no sound, and basically the onscreen display showed a symbol that indicated there was no device for the sound output anyway.Opening up System Preferences Sound Output will show you which output is selected, whether that’s your internal speakers or a third-party device. Audio settings already set on internal speakers but no sound in Safari, but works on everything else.A few days ago, my MacBook Pro decided suddenly to tell me that it had no Output Audio Devices for sound. Check the volume slider at the bottom, and uncheck the Mute box if necessary.Then select the “Play Feedback when volume is changed” box.Go to System Preferences-> sound and put the tick on “Show volume in menu bar”Run terminal and type sudo killall coreaudiodChanging the settings for internal speaker.Backup computer. No audio in Safari, Firefox, and Chrome when playing videos after OS Sierra update.Restart your iMac, MacBook Air, Macbook Pro, or MacBook Pro with Retina Display.In OS Sierra, the sound output changes from default to installed HDMI display speakers. If you have any external device which is attached with speakers, Mac wants to make that output device.Go to System Preferences -> Sound and change the output device to Internal speakers.Go to System Preferences -> Sound. But speaker volume buttons on keyboard & Sound Output slider on System Preferences still works. Can’t adjust volume for speakers. A peripheral with audio function can include a source terminal.Continue holding keys down until computer restarts and the startup sound for the second time, then release those keys. Press and hold Option-Command-P-R keys combination before the gray screen appears. Find Option, Command (⌘), P, and R keys in your keyboard.
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