PowerMacG4 won't start without old Cinema Display attached

PowerMacG4 867dp (Mirror Door)
NVidia GeForce4mx w/ADC+DVI
20" Cinema Display w/ power switch, on ADC port
Acer 23" G23HL, on DVI port
    I replaced my failing ADC with a new display (with much-appreciated help from this board!) Works fine as dominant display (currently not mirrored) but I need Cinema Display attached and powered up to run system. The Power Switch on tower lights, but won't shut down system, or start it without ADC attached. (It won't control system at all, only Power Switch on ADC works) Nothing in Preferences seems to apply. Should I just duct-tape new Display over old ADC and move on???       THANKS!

Thanks for your response BD Aqua. I don't have those diagnostics and frankly still wouldn't have a clue if I did. I was hoping I had overlooked some simple Preferance-type step in the change-over, but beyond maybe changing the old battery next, I'll just put one screen in front of the other- fortunately I've got room.  Thanks again for your reply!

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