How to reset admin password on Mac OS X

If you have just bought a MacBook or iMac from a garage sale or inherited one from a family member and realized that they didn't give you the admin password, or you're just forgetful, this is how you reset the password.

• Using a Mac OS install disk
• Without a Mac OS install disk

Using a Mac OS install disk

• Turn on your Mac and boot from the install CD.
• If you're using Mac OS X 10.6, navigate to
  Utilities > Password Reset
  and create a new admin password.
• If you're using Mac OS X 10.4 or 10.5, navigate to
  Utilities > Reset Password
  and create a new admin password.
• If you're using Mac OS X 10.3, navigate to
  Installer > Password
  and create a new admin password.

Without a Mac OS install disk

If you don't have an installer CD, it's still easy to reset the admin password.

• Turn on your Mac and boot in single-user mode by pressing Apple+S.
• Once it boots into single-user mode, you have to mount the hard disk in write mode, delete the .AppleSetupDone file under /var/db/ (note the dot before the filename because it's hidden) and reboot. Prior to this, we'll check the hard disk consistency with fsck So, type this:

/sbin/fsck -y
/sbin/mount -uaw
rm /var/db/.AppleSetupDone
reboot

Let me know how it goes. You can always contact me on email.