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Message: <blockquote data-quote="chas_m" data-source="post: 1622854">1. Boot from Snow Leopard 10.6 DVD you bought.2. Instead of installing a system, wait for languages question to load and then use the menubar to open Disk Utility rather than proceeding with the install.3. Use Disk Utility to do a one-pass-zeros wipe of the internal HD.4. When finished, the computer will reboot. Hold the mouse key/trackpad key down until the disc ejects, and then the computer will just blink a question mark at you. Shut down by holding the power key for four seconds.Voila. You have a completely clean, no-OS-included computer for someone to buy. You can opt to install the Snow Leopard on it as a clean install if it will help you sell it. The buyer can use that, set up their own account, or install something else on it as they like.</blockquote>