Complete pain >.< I went through several attempts, changed lots of bios settings and such, just cant get it to work. I have a dual boot setup with windows 7, Ive had them sucessfully run together before on a diff system, just wont work on my new mobo/setup. Heres what I got:

XFX nForce 750i with onboard 9300
PCI-E nVidia 9800GT 512
Core 2 Duo
4 GB DDR2 800 RAM
SATA HDD
SATA DVD
iPC 10.5.6 Final Release
USB keyboard/mouse

PLEASE HELP O.O

Forgot to mention, it boot loops the install disk unless i type cpus=1, and will only boot after install with "-v -f -x cpus=1"

Check this thread, hope it help you or try to install Retail OSX with DSDT Patch