i have this same mobo, but i do not have 2 internal hd's. i have an external hd i would like to use to do the install, but would like to also install 10.6 on my internal hd that currently is running 10.5.8. how can i install 10.6 over my 10.5.8 install once it is installed to the external hd? is what i'm asking even making sense? thanks in advance...