I want to reset my computer to close everything and start new

i have a mactinosh g5 and i have the mb427z/a. i want to reset it and start with new everything but i dont know how to so please help me

Throw away any files which may contain sensitive data, securely empty the Trash, insert its original disk, restart the computer with the C key held down, use the Disk Utility to erase the partition with Mac OS X installed, and install a fresh OS onto it.
If you're going to sell or give away the computer, include the disk with it.
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