My G4 has OS X Leopard 10.5. Since a few weeks my DVD reader does not respond. I put in a DVD, no icon pops up on the screen, and seconds later the door opens. The CD reads and writes without any problem. I plan to replace the optical drive myself. Saw a Youtube video and it looks fairly easy, even though I've never worked on a Mac before. I've checked out an optical drive from Other World Computing. They offer a Lite-On Super-Multi Drive for $33. It can also burn DVDs. That's nice, but I don't really care to burn DVDs, only CDs. However, I watch movies on DVD. I might also have to re-install the OS due to problems with shut-down and sleep. Somewhere I heard that Panasonic makes an excellent optical drive. Any advice about optical drives and where to get them?