Clean install of Leopard 10.5

Hi

I'm in the process of selling my macbook and want to erase my data and clean install OS X for the new owner. I boot from disc, go past the language prompt and the message pops up "cannot install OS X on this computer"

What the heck do I do with that? Its already running 10.5, so Im really confused.

Anybody any clues?

Find your own disc. You'll not be able to install it with the grey disc borrowed from someone else. Those discs are specific to the system they shipped with.

Oh I didn't know the discs were for specific hardware. I can only find one set, and those must be for my imac. What to do if I cant find the discs for my macbook ?

Quickest, latest, easiest way..... go to Apple store, or anywhere else that sells Snow Leopard, and install it. $25-$29.
Other option, is to set up a new admin account, and delete your old one, but this is not the most efficient method, firstly, because you want to test it for a while to be sure, secondly, because you can not perform a clean install, and ensure that your data is safe, and also because, selling it without install discs is loosing you more than the install discs are worth.
I could go on and on about it, but beer number 6 tells me that I shouldn't