InfiniteMac OSx86 - Trying to install Retail Leopard DVD onto Asus P5Q Deluxe- Bootloader won't see DVD

Hello all at InfiniteMac,

This is my first post and I'd like some help as to where I'm going wrong;

I have an Asus P5Q Deluxe setup with an Intel Core2Quad 9550 cpu and a modified BIOS supplied from another hackintosh site.

I have an Nvidia Quadro 4500 with modified EFI strings, and my bios is set to AHCI with another harddrive waiting for leopard, whilst my first drive has Windows7.

From the same site I downloaded a Boot 1-2-3 Bootloader which apparently was for the P5Q deluxe.

I am using a retail copy purchased from the apple store and have also a snowleopard genuine copy.

I have set the system to boot from CD

The boot loader startsup and I wait for the boot prompt to appear.

I eject the boot 123 and replace with the leopard disc.

When the leopard disc activity light stops, I press enter, and then it goes to the screen where it asks for 80, 81 etc.

However, it does not see the Leopard media as a boot option, instead referring me back to the boot prompt. I have gone right through from 80 through 99, with no success.

Where am I going wrong?

Many thanks in advance, and sorry to be so thick :(