Restoring Powermac g4 cube to factory settings

Click here and follow the instructions. When you reach step 5, insert its original disk, restart with the C or Option key held down, use the Disk Utility to erase the internal drive, and install a fresh OS.

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If you have a set of installer discs that came with the model you have:

1. Boot from the installer disc by restarting and holding down the C key until the Apple logo appears with a spinning gear below it.
2. When startup completes you may be asked to enter your language.
3. At the main install screen click once on the target drive, then click on the Options button.
4. Select the option to do an Erase and Install.
5. Click on the OK button.

No. You need either the computer's original disks or a retail Mac OS X 10.5.6 or earlier one.

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Or...

Open System Preferences>Accounts, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.

In the same pref pane highlight your old account, click the little minus icon, then use Disk Utility to Secure Erase Free Space.