LCD Screen not detected by macbook

Hi everyone!
I have spent 4 hours trying to figure this out, went to a million different forums, didn't find a solution. I hope you guys can help me!
So I have a Sceptre X20G-NAGAIII 20" LCD display which supports dvi and vga.
http://www.sceptre.com/products/lcd/Specifications/specx20gNagaIII.htm
When I connect it to my macbook via a dual link dvi cable and the Mini DisplayPort to dvi cable (both have the right amount of pins and plug in perfectly) Nothing happens. Tried rebooting. Still nothing. The "Detect displays" button in display preferences just doesn't do anything.
I even tried rebooting the MRAM (pushing commandoption+pr at startup) still nothing.
Does anybody know what's wrong??
Thank you in advance for your help, which would be so very much appreciated!!
Have a goood day
Hoodeh

Have you been able to get the same cable and adapter to work with any other LCD monitor? If not, it would be good to try that to confirm both the adapter and the cable don't have a problem like a shorted or open pin or something like that.

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