I had parallels working wit voodoo 1.0 and mac osx 10.5.5. on the asus a8n sli premium but when i updated to 10.5.6. it didn't work anymore so if this is important to you you could go back to 10.5.5. (or reinstall) hope this helps or somebody could tell us why i would work in 10.5.5. and not in 10.5.6.
greetz Koelie