Volume troubleshoot
No volume on iMac - how can i fix
Ive been not sound settings and mute is not selected etc but still no volume
iMac 21.5″, macOS 10.15
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Best reply
Please try resetting the NVRAM and restarting in Safe Mode.
Both may take up to 10 minutes and are best done with a wired keyboard and no wired peripherals (printers, scanners, cameras, etc..) connected. Instructions for each are in the following links.