How do i know my iMac's name and password?
my iMAC desktop is asking for a name and password newest model
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Depending on the context here, there can be a couple of different answers...
Is this a new-to-you Mac?
Or is this Mac one that you've been using for a while?
If it is the former, you'll want to erase and re-install macOS. You'll have various problems with this Mac if you don't.
Erase and reinstall macOS - Apple Support
If the latter, the username is usually your full name as you type it, and whatever you set as a password.
If you've forgotten your password, here is how to reset it:
https://support.apple.com/guide/mac-help/reset-your-mac-login-password-mh35902/mac