How to Start the Diagnostic Mode on a MacBook Pro

Remove any external peripherals from your Macbook Pro, such as mice, keyboards or monitors.
Restart the Mac laptop.
Press the 'D' key as your computer boots and continue holding it until you see a gray start screen.
Choose your language and press right. Select the basic test battery by pressing 'T' or perform the more extensive hardware test by checking 'Perform extended testing.'
Click 'Test.' All test results appear on your Macbook Pro's screen.
VPS Hosting

How to Bypass the Administrator Password on a Mac

Insert the Mac OS X Install Disk ( No. 1) that came with your computer (not Mac OS X Install Disk No. 2).
Restart your computer and hold down the 'C' key on your keyboard. This will ensure your Mac boots from the install CD.
Choose your language and accept the license terms, then select 'Reset Password' from the Installer menu.
Pick your hard drive (probably named Macintosh HD) and choose the name of the administrator whose password should be reset.
Select a new password. Don't forget it.
Restart your computer and log in using the administrator password you just reset.
VPS Hosting

How to Boot a GParted CD on a Mac

Insert the GParted Live CD into the disc drive.
Restart the computer.
Press and hold the 'C' key until the Mac boots from the disc.
VPS Hosting