How do I reset an imac to factory settings? version 10.5.8

I am selling my IMac, and I need to reset to factory settings before doing so, it is backed up entirely and ready to go. I have followed intructions to hold command-r on boot up and it hasnt worked the last 10 time of me trying it. any suggestions?
Mac OS X
version 10.5.8
Processor 2.4 GHz Intel Core 2 Duo
Memory 3GB 667 MHz DDR2 SDRAM

Insert the computer's original disk and restart with the C key held down. The Command and R shortcut is only for computers with 10.7 or newer installed, and in the case of a factory restore, for Macs which originally shipped with those OS versions.
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