Note that this does not apply to Apple silicon Macs, since they don’t have a way to do this. If the problem is shared across all audio sources, it might be time to reset your parameter random-access memory (PRAM), which Intel-based Macs use to retrieve basic settings for your Mac and connected devices. Try restarting that particular app by selecting it, then choosing the Stop button at the top of Activity Monitor to see if your audio recovers. Make sure the arrow next to %CPU is facing down - this will show your most memory-hungry apps at the top. You can check which apps are hogging your memory by opening Activity Monitor, then selecting the %CPU column. First, make sure the problem can’t be narrowed down to any particular app or service. If macOS is randomly cutting out the audio and then restoring it without rhyme or reason, there could be something wrong with how your computer is using memory. This can be one of the most frustrating issues to experience. You should only need to do this once, as macOS should remember your choice. Pick out your speaker options manually to circumvent this issue.
As you may have guessed by now, macOS - especially when it is loaded onto a computer that’s connected to HDMI speaker systems - can get confused about which speaker to automatically pick. In the Output list, you should see options for all these devices, as long as they are connected. “What about my headphones, external speakers, or Apple TV?” you may be asking. This should restore audio to your native Mac speakers. At the top of the window, ensure Play sound effects through is also set to your device’s speakers.
While you are at it, take a look at the volume bar below and make sure that your output volume is turned up and Mute is unchecked. Try setting the sound to Internal Speakers (the name of the speakers might reflect your device, such as MacBook Pro Speakers).
In this tab, you should see options for choosing a sound device. Open the System Settings app in the Dock or from the Apple icon in the menu bar, then click Sound in the sidebar. Fortunately, this problem is easy to fix. When macOS first boots up, it sometimes does strange things when assigning speaker outputs, which can lead to radio silence. You might have tried to adjust volume controls, unplugged your speakers and plugged them back in, and tried to play media on a different device, but nothing seems to work. It doesn’t matter what video or app you pull up you get nothing. In this case, you get no sound at all from the speakers that you were using before the upgrade. This is for those of you who gladly upgraded but then found that your audio had cut out completely. Common MacBook problems and how to fix them.Common MacOS problems and how to fix them.5 reasons your MacBook keeps restarting and how to fix it.
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