I had a PowerMac G4 "Graphite" that had a DVD/CD drawer unlike any I've ever seen before. Instead of being a drawer that you set the disk on top of, it had what I can only describe as a 'plastic prong' that came out with a slot that you could feed the disc into. Once you pushed the disc in far enough it would retract back in taking the disc with it. Anyone ever see one of these? As far as I can remember, all of the other G4's that I have ever used had a standard tray.