I have same system as you and had the same problem with the first hazard distro which worked fine on my other system with athlon x2 and sb600. I got sl installed om the phenom 2 x4 sb750 system using the hazard client server distro. try that. Make sure you are installing from a sata optical drive and ahci in bios AND reduce your ram to 2g for the install.

After I install on phenom/sb750 system and boot sl. It fails with "mis-match between kernel and cpu pm". This distro needs the null cpu management kext. Anyone know how to add this to the distro from windows? I have the kext.