It sounds like a Firmware Password. You need to turn the computer off and unplug it from the wall outlet. Remove both memory modules. Wait about five minutes, then reinstall them. That should remove the Firmware Password.
In the left panel, highlight your username. Click 'Reset Password'. Key in your new password and verify it. For future reference, it is highly recommended that you place a hint. To finish the process, click the 'Change Password' button. Part 2: How to Bypass Mac OS X Password. Aug 28, 2017 Enter the old password of your user account in the Current Password field. This is the password you were using before the password was reset. Enter the new password of your user account in the New Password field. This is the password you're now using to log in to your Mac. Enter the same password in the Verify field. Enter the Apple ID login information that is tied to the Mac OS X user account and click “Reset Password” Click “OK” to confirm the new keychain creation; Enter and verify a new password, fill out the password hint field, and again click on “Reset Password” Click “Continue Log In” to login as the user account with the reset password. The process for resetting the admin password changes a bit if FileVault is turned on because FileVault eliminates the option to reset the password with Apple ID credentials. Fortunately, the method remains simple: enter a random password three times at the login screen, after which you’ll be prompted to reset the password using your Apple ID. Reset a MacBook or any Mac computer on macOS 10.15, whether you have the password or not. This action will enable the new owner to have a clean and fresh start. If you have forgotten your password, its recovery is not a priority if you want to erase and factory reset your Mac on macOS 10.15.
Forgot Mac Password? 4 Ways To Reset Your MacOS Password
However, there will also be a user account password you will need for full usage of the computer, but your ex should know that password. If she doesn't then see further:
Forgot Your Account Password
For Lion/Mountain Lion
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
When the menubar appears select Terminal from the Utilities menu.
Enter resetpassword at the prompt and press RETURN. Follow
instructions in the dialog window that will appear.
Or see Reset a Mac OS X 10.7 Lion Password, OS X Mountain Lion- Reset a login password, and
OS X Lion- Apple ID can be used to reset your user account password.
For Snow Leopard and earlier with installer DVD
Password Reset For Microsoft Outlook
For Snow Leopard and earlier without installer DVD
Jun 23, 2013 1:18 PM