DVI Display not working

Hi there,
I just bought a AOC 22" (22LVWk) monitor. When I try to use it's DVI port, nothing happens. The monitor displays "digital input" and it stays black, with some weird flicks on the left side. If I connect the analog in (using the apple adapter), it goes fine. It's a NVDIA 6600 card, 256MB. I tried both DVI ports, reseted the pram, nothing goes.
Could it be any sort of compatibility issue?
Regards,
Gabriel

I would say "yes, it is a compatibility issue." check with the manufacturer to see if the monitor is compatible with the installed video card.
  Mac OS X (10.4.8)  

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