I've been trying to do this for hours, but I've not found a solution. I simply want to install Leopard on my g4, but the horrible compatibility of this machine with the newer technologies is preventing me from doing so. I really do not want to spend any more money trying to get it on this old computer. This is what I've tried so far: 1. I was going to do it by disc. The problem is that my DVD drive appears to be unable to read DVDs anymore. I then remembered I had some IDE drives, but sadly recalled I threw them out, thinking I wouldn't need them. 2. Second option is to use firewire, however, I have no firewire cable, or any firewire harddrive. I've never even used firewire in my life. 3. Third option is USB with a .dmg? I'm in the process of using this guide (http://forums.macrumors.com/showthread.php?t=1112834), but why would this work? I thought you can't boot from usb with a powerpc imac? I'm currently transfering the large disk .dmg's which is why I don't know if it works yet. Does anyone have a working solution? I'd consider spending some money, but I really rather not.