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Just to clarify, do you want to connect a DVI display to an ADC port or connect an ADC display to a DVI port?
 
I got one from Sweetwater.com to hook my Cinema Display with my G4 Quicksilver.

I can't remember how much it cost but they deal with a lot of Apple stuff.

Other places you can check is Radio Shack but I think it will cost around $30

Or any Apple repair shops.
 
lol seriously look around your area for any Apple Repair shops. I bet they will have them laying around.
 
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