How to Record What You Hear ( Built-in Output ) for Mac (53,192) 10 Powerful Power Chord Variations (42,850) The Most Useful Pro Tools Shortcuts (40,526) The 50 Best Film-Score Composers and Their Greatest (33,085) How to Find the Sample Rate and Bit Depth of an Audio File (24,185) Free Overdrive, Distortion and Amp VST Plugins (22,000). What to do if the sound is not working on your Mac. A digital audio device had been unplugged and so the audio output remained locked on.

Use the latest version of macOS

The first step is to make sure that you're using the latest version of macOS. Back up your important information and then update the software on your Mac.

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Check your sound settings

If you still can't hear sound from the internal speakers after updating your computer's software, check your sound settings.

First, disconnect any external audio devices from your computer. Also disconnect any cables from the USB, Thunderbolt, FireWire, or 3.5mm audio ports.

1. From the Apple () menu, choose System Preferences.
2. Select Sound.
   
3. Click the Output tab, then select Internal Speakers. If you don’t see Internal Speakers as an option in the Output window, contact Apple Support.
4. If the volume slider is set low, move the slider to the right and test again.
5. If the Mute checkbox is selected, deselect it and test again.
6. If you still don’t hear any sound, contact Apple Support.