Okay so today i tried to start my old PowerMac G5, (the dual processor one, 8 memory slots) But it refuses both 10.4, Mac OS 9 and 10.5 CD's, so i though it might be something wrong with the reader so i used an external but found it also refused it, theres no hard drive in it so it just shows the folder with a question mark and a Mac OS 9 style finder icon, but it should still be able to read a cd, my PowerBook G4 does that atleast. Any idea how i can install an OS on it?. Yes, i know i need a hard drive obviously. I have some at home.