Sound System
There is no longer any sound on my computer i.e. music
iMac 21.5″, macOS 10.15
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What are you using to try to play sound?
Are there any headphones attached?
Are there any audio devices linked to bluetooth?
Is Airplay enabled for an AppleTV?
Did you check the Audio Midi Setup utility in Applications -> Utility to make sure your output is going where you want, and if only stereo at 48kHz or less?