I am trying to reinstall 10.4.6 and I cannot boot from the CD. I have tried booting using "C," and command, apple, shift, delete. So far no luck. When I double click the "Install OS X" icon, i get a "Mac OS X 10.4 cannot be installed on this machine. I have a macPro, 4 internal HDs with a 1+0 software raid. any help would be appreciated.