1) Power supply works, fan runs
2) HDD runs
3) Green LED is on
4) No startup chime
5) Nothing on screen
My Indigo2 (teal) does this from a cold start - pressing the reset button results in a normal start. Bit of a panic when I first got the machine, but it has started in this way many times now and seems fine; powering on while the machine is still warm goes straight to the chime.
The time is always July 1993, so the battery is dead but using the PROM "date" command each time is the better answer for me than trying to replace the battery, for the amount I use it.