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  1. Verify audio input/output by going to System Preferences > Sound > input/output. You will be able to verify that the correct device(s) are recognized and set as the default. 
  2. Run software updates, device drivers in macOS are packaged with  system updates so this will often resolve issue.
  3. If necessary, download the driver or device software directly from the manufacturer's website. Downloads from third party sites can often be bundled with malware and represent a security risk.

Apple Troubleshooting Pages

If your built-in camera isn't working on your Mac

Control access to your microphone on Mac

About the audio ports on a Mac

If you can't hear sound from your speakers


Windows 10 Additional Solutions