DVI port not functioning on G4 MDD

Hello, I just bought a 23" Apple Cinema Display and the Graphic Card on my G4 MDD 1.42 doesn't see it. The display stays black (doesn't come on). However the Firewire and USB ports work on the display.
The graphic Card is the original (I think) ATI Radeon 9000 pro. It has 64 MB of RAM. That should be enough and is said to support this display.
It seems to me that the DVI signal is not working. I say that because, with both a VGA to DVI and a VGA to ADC adapter, I can plug 2 CRT monitors and they all work fine.
Does anyone have a suggestion on how to solve this? Should I buy another card?
How do I know for sure that the card is not working. So far I tried it with 3 different DVI monitors and none worked. The display I bought is fine. I tried it on a mac mini.
Yvon

There have been many reports of new 23" displays with bad power supplies. Is there a another computer you could try the display on? the adapters shouldn't be a problem,

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