This morning, my G4 refused to start up as usual. Instead, I got a grey screen. Here's what I've tried so far and the results: Action: Started from DVD Install disk for Leopard to try an archive and install. Result: No hard drive was recognized for an install, archive and install, or erase and install, i.e., no drives appeared at all in the "Select a Destination" window, just empty white space. Action: Attempted safe boot (Command + Shift + V) Result: Flashing Globe Action: "Repair Disk" from Disk Utilities after starting from DVD Install disk for Leopard. Result: Received "First Aid Failed" message. Error message read: "Catalog file entry not found for extent. Volume check failed." I don't know what else to try and any suggestions are much appreciated, especially because I can't even get it to eject the install disk (the "eject" key does nothing and there's no manual eject button for this Power Mac). This is a work computer and not having it functional is pretty hobbling so. . .help! Many thanks in advance.