Sorry to be clear, I'm only using the VM to prep the USB installer (and it works great for that), I have another drive I'm using for OSX for and that is what I am having problems getting to work.
Can you please elaborate. Did you remove the existing ATY_init.kext?
How did you installd the DSDT and kexts?
I have a 6950 and ML in a VM under windows. I tried ###### but all I get is a kernal panic during boot.