I have a Gigabyte GA-EP45T-DS3R and am currently running 10.5.8 without any issues. I tried installing a retail Snow Leopard I received today and I too get a kernel panic on first boot immediately after loading of extensions. Have also tried on my GA-P35-DS3L with the same result.

I installed my retail copy from the DVD while booted into my Leopard install by running the OSIntaller.mpkg from Terminal. Afterward I installed Chameleon 2.0 RC1 using the EFI HFS method and replaced the boot file with EFI 10.1. I have a dsdt.aml with the RTC fix in Extra/ and the kexts I have in the Extra/Extensions folder are (all 64 bit versions):

• dsmos
• IOAHCIBlockStorageInjector
• NullCPUPowerManagement
• OpenHaltRestart
• PlatformUUID (with my drive's uuid)
• SleepEnabler

Anyone know why I am getting a kernel panic on boot? Anyone want to help point me in the right direction? Thanks in advance.