I've acquired a G4 iMac recently, and still loving the design of the thing, thought I'd try to recommission it just for a bit of web browsing, maybe watching the odd DVD or something. It's a 1.25GHz (which I believe is the fastest G4 iMac?) to which I've installed 2GB of RAM. It boots up quickly into 10.3 now, but I want to install 10.5. I have an original retail 10.5 disc, but the system will not boot from it. The DVD drive appears in the list of hardware under System Profiler, and it opens and closes OK using the keyboard button. It doesn't appear under Finder however, and does not create a desktop shortcut as it should when I put a disc in it when in the OS. iTunes cannot see a music CD in there, and DVD player cannot see a DVD. I have checked that all the boxes in Finder preferences are ticked to show CDs and DVDs in Finder. I have reset permissions in System Preferences and installed all updates to 10.3. The drive is also not listed in boot options (I only have the hard disk, or network as options there). I could understand if the drive was dead, but it opens and closes fine, and appears in the list of devices under System Profiler. Any ideas?