iMac 2017 can't find camera
iMac retina 5k 27" 2017 can't find camera
iMac 27″ 5K, macOS 12.1
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Welcome to Apple Support Community.
First, take a look at: If your built-in camera isn’t working on your Mac - Apple Support.
If the issue persists, test in Safe Mode: How to use safe mode on your Mac - Apple Support.
You may also want to Use Apple Diagnostics to test your Mac - Apple Support.
If you need more help, or Safe Mode and the other steps do not work, contact Apple Support: Get Support.
Jack