What a nightmare... First the Powerbook, now the iMac. I swapped the dead hard drive in my iMac G4 for it's original 60GB drive which I confirmed works. Turned the computer back and got the Mac ? flashing which indicates no operating system installed. I tried to open the CD tray to put in Tiger but it wouldn't open... This is what I tried - Eject button - Command E - Hold down Mouse - Open firmware eject CD - gives message "can't OPEN the EJECT device" - SMC reset I took the base off and confirmed no cables on the optical drive were lose. Last time I had the optical drive open I had disk warrior running to confirm the hard drive was dead. I am pretty sure the disk warrior disk ejected no problem, so the tray should be empty.