Only starts when monitor is unplugged...

G4 Quicksilver -- dual 800 with AGP video card will only start if the Apple Cinema Display is unplugged from the card, or the card is removed from the machine.
Also, the internal firewire ports recently went dead and were replaced by a PCI firewire card.
Am I looking at a dead video card, or something else?

I hooked up a monitor to the VGA port on the card and it works. Is there anything I can do with the Apple Cinema Display to find out what is wrong with it? It's old, but I'm still happy with the 22" widescreen.

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