My Mac book which we just bought is locked because our password is not working. How can I open it?
How to open my Mac book because my password does not work.
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If you just bought it new, it will start up to the setup screen where you will assign a password.
If you bought it used and it's requiring a password, the seller did not prepare it properly ... take it back.
If you just forgot your password: https://support.apple.com/en-us/HT202860