How to Unlock an Apple Mac Book Password

Locate the Mac OS X install disc your computer came with. If you don't have it, you may be able to get another one from Apple by calling (800) SOS-APPL. (You will most likely have to buy another one.) Insert the disc into the optical drive.
Restart the computer while holding down the 'C' key. A 'Utilities' or 'Installer' menu will appear, depending on which version of OS X you are running. Select 'Reset Password.'
Select 'Macintosh HD' from the available volumes. On the drop-down menu, select the name of the original administrator account. Do not select 'System Administrator.'
Choose a new password and enter it in the two fields. Click 'Save.'
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