It says in the diagram that pins 3 and 11 relate to the power state. Their reasoning is that some of the later AGP cards will cause the no post condition if you dont interrupt those two pins, so I am thinking the same reasoning applies in my case. Even though my G4 will post if there is no ADC connection, it stands to reason that it uses the same bus to communicate a 24V / no 24V state when an ADC connection is made, even if it is just an adapter. So I am going to try this scotch trick and report back in a few days.  At the moment I am using the DVI output from the Geforce4 MX32 card  for one of my monitors and the DVI output from the ATI 7000 PCI card for my second monitor.