My Sawtooth won't turn on! I have replaced every component other than the logic board and power supply with spares. When I press the power button, nothing happens. Is it the logic board, power supply, or something else? 
Power Mac G4 won't turn on
Maybe the button is faulty?
look up the pins (or you could just run a screw driver over the pins) where the button connectors connect to the board and try starting it that way.
I reseated everything one last time, and it turns on now! :scrambled: