I have a SL installation using retail disc on my EP35 board with NVidia card runs smoothly, but on my other spare PC, which is a HP DC5700/Q963/C2D E4300.

I have installed Chameleon RC3 with PC-EFI 10.3, with these in /E/E:
Disabler
fakesmc
NullCPUPowerManagement
OpenHaltRestart
PlatformUUID

On a small partition and the SL disc image on another partition, I can boot into the Chameleon bootloader, and choose the drive to boot, which is the SL disc. I checked in verbose mode an dit always hangs at

Hangs at ACPI:System State [S0 S3 S4 S5] (S3)

Is there any clue on fixing this issue? Thanks!