Powerbook G4 won't install Leopard...

I've done 2 days worth of research across the web but can't find a solution for my issue.
My boss has his old Powerbook G4 800MHz (i know what some of you are already thinking...) with 10.2.8 loaded on it. We purchased the retail Leopard disc a while ago just as a backup in case something were to happen, so the version on that disc is 10.5.1.
I tried doing the Open Firmware steps (http://lowendmac.com/osx/leopard/openfirmware.html) as well as the Leopard Assist (http://www.mac.profusehost.net/leopardassist/) of which the Open Firmware article said that it might now work on the PBG4 that we have and that I may need to "reset min-cpu-frequency and max-cpu-frequency" I was wondering if there is a way that I can reset the frequency or get around loading up Leopard??
Thanks.

BreuerEditor wrote:
As for your notes, 1) The Leopard Assist and Open Firmware "tricks" the computer into believing it has the extra processing power to install it.
Apple Discussions is not the best place to ask about how to subvert this kind of stuff. Poke around any of the various hardware hacker sites or on Usenet if you really want to do this.
2) My install disc DOES have 10.5.1 and I bought it December 2007 alongside a MacBook but haven't loaded it on any computer since it wasn't needed at the time, just as a security backup. It is NOT an install disc from any computer.
Sorry, not possible. To this date, Leopard retail packages have only ever included 10.5.0 or 10.5.4. Either you are mistaken about the version of OS X that is on your retail install disc, or the 10.5.1 install disc you have is not a retail version.

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