How to Prepare my imac G4 for recycling

Hello
I have an imac G4 about 9 months ago the screen died and I decided to get a new 27" imac. I've gotten all the information I need from the G4 and I'm ready to recycle it but I would like to know what is the best way to remove "ALL" information from the G4.
I can access the G4 with the new 27" so if I need to perform any specific commands (format disk) on the G4 that can be done using the 27".
Thanks for your help.

You have to be booted from the grey system CD/DVD that shipped with the computer and use the version of Dusk Utility on the optical disk to modify the hard drive. The system "protects" the boot volume from unintentional changes this way.
Insert the CD/DVD in the optical drive and hold the "c" key while booting. The installer will launch but instead choose Disk Utilities from the menu. It's different for 10.3 and 10.4, so you may have to explore a little.
If you've misplaced the optical disks that came with the computer, this is going to be harder. Post back if that is the case. You can use another Mac to reach the drive on the iMac.

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