I tried taking the battery out and also hitting the PMU button, no luck. I am positive that when any ADC connector is attached to a Geforce 4 MX card when installed if the certain mac G4's, the mac is told to stop and wait for a return signal from the ADC monitor. In absence of that signal it just sits there like an old lump of coal. I tested this with a couple of older ADC Geforce cards I have and the problem did not manifest itself. Since I can make the problem happen on demand by simply plugging in an ADC to DVI adapter by its self with no DVI cable attached, that tells me that the adapter shorts across a couple of pins telling the video card to look for a voltage on another pin. I am going to attack the adapter with my ohm meter to see if indeed there are a couple of shorted pins, or if a pin shorts to ground that should not otherwise being doing so.