I've tried the Vanilla 10.6 install with Cham RC4 and RC3, boot loader works fine, tried also the Hazard distro to no avail. I've searched google and seen a few people mention successful installs, but I'm missing something. I have the correct bios settings, and extensions, and even was able to get a DSDT.aml from someone over at another site.

Basic issue is I get up to the grey apple screen, and no more than a milisecond later, automatic reboot.

Looking for other people out there that have gotten a successful Asrock P55 Pro going. Also I have a i5 750, with a GTS250.