You will need to create a new admin account to access the MacBook. Follow the steps below.

Creating a new Admin on Mac Os X:

• Here’s how to reset your OS X password without an OS X CD.
• the Working solution for me was to create a new admin
• you can create new admin like this by deleting a specific file

You need to enter terminal and create a new admin account:

• 1. Reboot
• 2. Hold apple key + s key down after you hear the chime. (command + s on newer Macs)
• 3. When you get text prompt enter in these terminal commands to create a brand new admin account (hitting return after each line):

mount -uw /

rm /var/db/.AppleSetupDone

shutdown -h now

• 4. After rebooting you should have a brand new admin account. When you login as the new admin you can simply delete the old one and your good to go again!