TweetI sold an old one a while back and here's how I got it ready to sell~
To answer your question, you need your original discs, which you still have right?
Startup from the System Restore CD (hold down the "C" key during startup until you're convinced you're starting up from the CD)
From the Menu bar, depending on what version of the operating system you're running you can use "Disk Utility" to wipe the drive free of any personal information. This zeros out the drive, initializing it for use again. You can use 1, 7-pass, or 35-pass initialization to wipe the drive clean.
Then exit Disk Utility (Command-Q). Follow the screens as Apple leads you to reinstall the operating system.
1. Select your main language
2. Continue through the Welcome screen
3. Agree to the Apple Software LIcense Agreement
4. Select the installation destination
5. Optionally select a different installation option to suit your needs
6. Optionally customize the installed packages to suit your needs.
Finally, the installation will execute, and the computer will eventually restart without any further user interaction."
The installer gives you three options (from the screen):
"Upgrade Mac OS X. --> Upgrades Mac OS X from an earlier version. Upgrading is not intended to removed previously installed applications or files.
"Archive and Install ---> Moves existing system files to a folder named Previous System, and then installs a new copy of Mac OS X. You cannot start up your computer using the Previous System folder.
"Erase and Install --> Completely erases the destination volume and then installs a new copy of Mac OS X."
Select the last option and, when the installer quits and the computer restarts, eventually the "Welcome" screen displays and there's some cool music.
Press and hold the power button for eight seconds. The computer turns off and you've prepared the machine for resale.
When you're purchaser powers on, they get the 'Welcome" screen and the system is transferred to the new user.
Stay Strong~~!!!
IPL