Similar problem as previous poster. I've got a blue G3 w/VGA port. I just got an ADC monitor after long travails I won't bore you with. I got a DVIator (
http://www.dviator.com), which may help previous poster?? Not sure - I don't understand all the variations in VGA ports & cards. I also got a VGA>DVI adaptor for a few bucks. So I'm going VGA through the adaptor to DVIator to ADC monitor. No luckee.
Just so you know I'm not an idiot, I originally got a 17" blue monitor but it was delivered broken The thing was so heavy and big I decided I wanted to get something else and was ready to return it and get some non-Mac VGA product... but the company that sold it to me would give me a replacement but not my $ back and could offer me nothing but the ADC. They told me it would work with my current scenario.