How to Unlock a MacBook Without a Password

Insert the Mac OS X install disc in the MacBook and restart the computer. Hold the 'C' key while the computer starts to force it to start from the disc.
Choose your language and click the 'Arrow' icon. Click 'Utilities' and select 'Reset Password.'
Click the hard drive in the window to select it. Click the username for the main account in the drop-down menu. Type a new password, then re-enter it in the confirmation text box. Type a password hint for the account. Click 'Save.'
Click 'OK' on the confirmation pop-up window. Click 'Installer,' then 'Quit Mac OS X Installer.' Click 'Restart' to reboot the MacBook.
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How to Get Rid of Pinwheel on Mac (6 Steps)

Click the desktop screen to access the Finder menu, and click the Apple menu at the top of the screen.
Click 'Force Quit' and select the application that has 'Not Responding' next to it in parentheses.
Click 'Force Quit' in the list of currently running applications, and click 'Force Quit' in the pop-up dialogue box to confirm you want to shut down the application. Any unsaved information in the application will be lost during the force quit action.
Click the Go menu at the top of the desktop, and click 'Utilities.'
Double-click 'Activity Monitor' and click the :'System Memory' tab near the bottom of the application window.
Click 'CPU' to sort the running processes according to central processing unit usage, and click the process that has a high CPU number. Click 'Quit Process' to close the process, free up memory and restore stability to your computer's memory.
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