I managed to figure out what was going wrong. I reinstalled some of the kexts that came on the original disk that I didn't try the first time, and that did it. It now boots with all my bios settings at their defaults, with dual core enabled. The keyboard, and the touchpad work fine (I just can't scroll using the right side anymore, but that is a small sacrifice I am willing to make). Wifi detects my Atheros Card, but it can't find anything however. Thank you for all your help so far! My installation of 10.5.7 has come very far, very quickly!