locked out of imac
Not accepting my password and mouse and keyboard for 24" iMac is locked out
Apple TV 4K, tvOS 16
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Force a restart, and try again: Shut down or restart your Mac - Apple Support
FWIW, make sure it’s not caps lock or a stuck key, too.
You can use USB-C to Lightning cables to directly connect the keyboard and rodent to the iMac, too.
If not that, then here is what to do to reset the password: https://support.apple.com/en-us/HT202860