Turn it off and on again: Sometimes the process of restarting your Mac can solve an issue like this. The video may be muted by default, requiring you to choose to hear the sound. If you are watching a video in Safari and there is no sound you will find sound controls in the video window so you should be able to adjust it there. Check a different app: It is possible that sound is playing in iTunes or Music but not in Safari, this may be because the sound is turned off in Safari. 
If this doesn’t work then try clicking on the Volume option in the Menu bar at the top of the screen.
When you tap this an overlay should appear on your screen.
Turn up the volume: Make sure the volume isn't turned down - press the Volume Up button, usually located on the F12 key in the top-right of the keyboard. After you have pressed Play you should see the bar progressing even if you can't hear the music. Open iTunes/Music click on Songs and select any track in your music collection. Play something: To begin with, check if there is definitely no sound coming from your Mac by playing something in iTunes or Music (Music replaces iTunes in Catalina). Here's what to do if the sound stops working on your Mac #SPEAKERS FOR MAC MINI 2016 HOW TO#
How to fix a Mac that's not playing sound If when you press the volume controls (usually F11 and F12) they appear to be greyed out, or if there is a red light beside the headphone jack, here's what to do. If the sound has stopped working on your Mac follow these steps to help you get your Mac's internal speakers working again. How to fix a Mac that won't play sound through the TV How to fix a Mac that won't play sound through speakers/headphones
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