You will need to plug in a headset or external speaker, or use the Switch to Phone Audio option to listen via your phone's speaker. If you do not see a speaker listed, this means your computer does not have any speakers connected.
Choose another speaker from the speaker selection list and try the audio test again. Click the upward arrow to the right of the Mute button at the bottom of the Zoom window.
If your speakers appear to be on and the volume is up, but you still cannot hear the audio, check Zoom's audio settings and select a new speaker. (Look for your computer's audio controls and turn up the volume.) Make sure your computer speakers are on/not muted. During the test, if you cannot hear any audio:. Always run an audio test before joining or starting a Zoom meeting. To make sure you have the most current version, check for updates. Zoom updates it's software on a regular basis with important security items as well as updates to features. Thank you for using Apple Support Communities.This document provides an overview of how to test audio in Zoom. You can take your Mac to a Mac Genius or Apple Authorized Service Provider to replace the battery on the logic board. The logic board battery helps retain NVRAM/PRAM settings when your computer is shut down. 
If issues persist, your Mac's logic board battery (not a portable Mac's rechargeable battery) may need to be replaced.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.Īfter resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information. Press and hold the Command-Option-P-R keys before the gray screen appears. You will need to hold these keys down simultaneously in step 4. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You can use these steps to reset your NVRAM: For example, if your Mac starts up from a startup disk other than the one you've specified in Startup Disk preferences, or if a "question mark" icon appears briefly when your Mac starts up, resetting NVRAM / PRAM may help. If you experience issues related to these functions, you may need to reset the NVRAM or PRAM. Recent kernel panic information, if any. Information stored in NVRAM / PRAM includes: On Intel-based Macs, this is stored in memory known as NVRAM on PowerPC-based Macs, this is stored in memory known as PRAM. Your Mac stores certain settings in a special memory area even if it is turned off. 
If you are noticing issues with the speaker volume on your MacBook Pro, you may need to reset the NVRAM:
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