I can not log into my iMac. It does not accept my Apple ID or password
Cab log into my iMac
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Generally a “Mac login” is a “local user” login vice your AppleID + Password.
If you can’t recall it, start working thru this article:
https://support.apple.com/en-us/HT202860
Just keep working down the list; an on to the follow-on article if necessary.