I just set out to initialize the drive of my old G4 800 DP, using the system disc. Everything began fine but when I returned the screen was black, and video wasn't being picked up. I decided to force reboot and start over, but now I cannot get my mac to boot at all. Black screen with no video. Cannot boot from firewire target drive. Machine won't recognize system disc. When I boot there is no chime. I hear the machine apparently working hard to read the system disc but nothing happens and it eventually ejects the disc. I've tried 3 different discs, so I know it's the machine not the disc. Pressing "option" at startup has no effect. I also know it's not my LCD, as it works fine with my other machine. Anyone have any idea about what's going on here and what I can do to regain access to my machine? Thanks.