I know others have experienced this but I can not seem to find a solid lead on solving this issue for me. I can boot any other kernel just fine. I installed iPC 10.5.6 (this also happened with iDeneb and any other distro) and if I try to boot up with the vanilla kernel the machine just reboots right after the Darwin bootloader.

My board is a P43Twins1600 and I have all the hardware working running a C2D E8400.

Thanks for any insight guys.