External monitor green

I have a 12" G4 iBook with a broken screen. Before replacing it I plugged it into an external monitor. The iBook booted up just fine, but the monitor was green! I fiddled with the iBook display settings and the monitor's settings to no avail. Does anybody have an idea what is going on here? Many thanks.
John

Have you tried running the Apple Hardware Test? If there is some sort of problem with your video RAM, it should show up in the form of an error code.
Is the problem just with this particular display? It might be worth trying another external display if you could find one to borrow or use, just to isolate the problem either to the iBook or to the display.
Good luck!

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