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No sound through hdmi - macbook pro - Apple Community
https://discussions.apple.com/thread/4134669
Using either Finder or Launchpad go to Applications > Utilities > Audio MIDI Setup. On the left-hand side of the window you should now see HDMI. In the middle of the window, on the Output tab, where it says "Source:" select your TV from the drop-down list.
Connect to HDMI from your Mac - Apple Support
https://support.apple.com/en-us/HT204388
Check if you need an adapter. Mac computers that have any of the following ports can …
Fix: HDMI Sound Not Working Mac - Appuals.com
https://appuals.com/fix-hdmi-sound-not-working-mac/
Enable HDMI Audio & Toggle Sound Output from Mac OS X Quickly
https://osxdaily.com/2013/05/04/use-hdmi-audio-output-mac-os-x/
Hold down the Option key and click the Apple menu, then choose “System Information”. Select “Audio” from the Hardware menu. Click the triangles to open each audio channel option, and look for “HDMI Output”, “HDMI / DisplayPort Output”, or something similar.
macbook pro - External monitor on HDMI but no sound - Ask ...
https://apple.stackexchange.com/questions/259140/external-monitor-on-hdmi-but-no-sound
If the screen is connected and switched on, you can select the speakers of your HDMI screen in System Preferences > Sound > Output. Or if you have the audio volume button in your menubar, you could select it through OPTION + …
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