I made a mess of a 20 inch "sunflower" G4 iMac while attempting to reinstall Lubuntu beside OS X 10.5 (so I could dual-boot) when, uncertain how to proceed, I cancelled partway through. The drive dumped the install DVD and the machine became unresponsive. At reboot I get the usual Mac chime, then a grey screen with a tiny folder icon blinking between a OSX symbol and a question mark. Sooo...I searched forums like this for help. I tried recommended routines to hold key combinations during booting to unstick matters; none did. I can't find a way to insert an install disk into the DVD drive (no evident manual release button). At this point I'm stuck. It's such a shame to see this elegant machine to be reduced to a 40-pound paperweight, so I hope someone can help guide me through its restoration to a working state. I have the following possibly-useful items with which to attempt a recovery: Install disks for OS X 10.5 and Lubuntu 14.04 for PPC An early-2006 32-bit Intel iMac Core Duo running Peppermint 8 (Ubuntu 16.04 variant), which has FireWire 400 ports and a DVD burner A working 40 GB FireWire external drive A firewire 400 cable that can interconnect the two Macs One thing I do not have is a keyboard original to this Mac. The Apple aluminum keyboard I ordinarily use with it isn't recognized by this older iMac until after startup is complete, so I keep a generic USB keyboard handy that allows keystrokes during the startup process (well, at least it did before I hashed the OS). Any advice for how to get this treasure back into gear?