Sounds hopeless, but worth a shot. It's a PowerBook G4, 15" model A1046, and this is what's going on. Powers on, checks combo drive, gongs, no flickering or lighting on screen, period. Tried a PRAM reset several times but it NEVER gongs a second time. I tried booting to Open Firmware and typing mac-boot, blind, but nothing. The keyboard clearly works, as the caps lock light works. The hard drive spins up, the fans run at normal speeds, so everything else is clearly functional.