George -
you should be able to boot this machine with any OS seedie from 8.1 on up.
I recommend that you try using a disk utility seedie (Norton, Disk Warrior, TechToolPro) so that if there is software damage to the HD, you will have a shot at reparing it once booted.
Follow Kelly's advice about zapping the PRAM, then try again booting to a known-good seedie with a valid OS on it.
One other possibility - not long ago I encountered a malfunctioning Kensington trackball that completely prevented a beige G3 from finding a valid system folder anywhere (on the HD or seedie). Once it was disconnected, the Mac booted perfectly to the HD or seedie, just as it did before the start of the troubles.
- kbeartx