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In Mac OS X v10.6.8 or earlier, follow these steps to reset a password when there is only one administrator account on the computer, or if the original administrator account needs a password reset. "Original" administrator account refers to the one that was created immediately after installing Mac OS X. If the original administrator password is known, that administrator account may be used to reset the passwords of other administrator accounts using the steps described above. These steps require an optical drive; if your Mac does not have an optical drive and you have a Mac OS X v10.6 Install disc, see below.
Start up from a Mac OS X Install disc (one whose version is closest to the version of Mac OS X installed). Usually, you can start from the disc by putting it in your computer, restarting, and holding the C key. Or, put it in the computer and click the Install or Restore icon you see in the disc's main window (after which the computer will start from the disc without you needing to hold C). Or, you can use Startup Manager or the Startup Disk preference pane to select the Install disc.
Choose a language, click the arrow button to continue,
Mac OS X v10.6 or later: Choose Password Reset from the Utilities menu.
Mac OS X v10.5 or v10.4: Choose Reset Password from the Utilities menu.
Mac OS X v10.3: Choose Reset Password from the Installer menu.
Tip: If you don't see this menu or menu choice, you're probably not started from the disc yet.
Note: The default keyboard layout is U.S. English while started from the installation disc. If you use a keyboard layout other than U.S English, use the Input menu (the flag icon on the right side of the menu bar) to select the desired layout before typing a new password.
Select your Mac OS X hard disk volume.
Select the user name of your original administrator account.
Important: Do not select "System Administrator (root)". This is actually the root user. You should not confuse it with a normal administrator account.
You should format the internal hard disk and install a clean and fresh version of Mac-OS anyways and create a new user-account. If there is no install-disc included, try calling Apple, tell them your eMac's serial number (All eMac's have their serial numbers printed inside the disc drive door), and ask them if they have any replacement install discs for your model of eMac. Check out the Apple eMac support page or the Apple eMac support forum for more informations.
You don't need the admin password to restore a Mac from its installation discs. Insert the disc, then hold down the C key as you are starting up, to boot from the disc instead of the hard drive. Continue with complete restoration of the original machine contents.
Try hitting the ENTER key when prompted for the password. Let us assume the seller was kind enough to remove the password before selling the Mac. If you are not in luck, try borrowing a System disk from a friend (most Mac Users are really friendly), and maybe they offer you a copy of the CD/DVD. After booting from the CD, you can reset the password easily.
Get a copy of Tiger OS10.4 on DVD. The latest system, Leopard (OS10.5) is a bit too heavy for a cube. You can either purchase from Apple or "borrow" a copy from someone. Apple system software can be installed on more than one machine. Put in the DVD and restart holding down the otion key so the computer starts from DVD and follow the instructions for a "clean install" erasing the hard drive.
Install a new OS. Insert OS X disc while holding down the "c" key on the keyboard. This should open the installer on the OS X disc. Do a "clean install". When the installation is finished and you are up and running, reinstall your other software. This should only take an hour or two depending on your computer. Now you have your own OS that is not cluttered up with another persons ****.