This morning I've done the following:
Reset the PRAM. Result nil. (except for loud start-up ding from now on)
Run Disk Warrior. Only minor errors found; directory replaced. It still won't boot by itself.
Booted into Verbose mode, I've never done or seen that before. It stopped on AirPort: Link up on en1. When I held down the power button to reboot again, Verbose said "sleep prevented:
(I am waiting a long time for anything else to happen in between these attempts.)
Rebooted with alt key down in order to eject Disk Warrior disk.
It seems to me that my sole remaining option is to boot from the Instal DVD.
edited to add: I have no firewire cable here.
