How to Reinitiate the Setup Assistant on Mac OS X 10.5 or Later

Do you have a locked Macbook with MacOS X? Here's how to login and unlock it.
STEPS

1

TURN ON YOUR MACBOOK.

2

PRESS AND HOLD THE [APPLE] AND "S" KEYS WHEN YOU HEAR A CHIME SOUND.

3

RELEASE THE KEYS WHEN YOU SEE COMPUTER CODE ON A BLACK AND WHITE SCREEN.

4

TYPE AT THE PROMPT: /sbin/mount -uw /

5

PRESS THE [ENTER] KEY.

6

TYPE NEXT: rm /var/db/.applesetupdone

7

PRESS THE [ENTER] KEY.

8

RESTART. Your Macbook will restart and you can create a new user and password by going through the installation wizard.