neosin,
I've recently had exactly the same issue with a DVI cable. I moved my computer around and used a spare 24pin DVI cable to connect the th2go. Afterwards all I got was a mess on screen. I though OMG what have I broken now, so I moved the computer back, plugged in the Matrox supplied cable and all was well. So I hadn't broken anything!
I double checked the 24 pin cable and found in tiny writing along its length that is was single link only! I went out and purchased a proper dual link cable (3m) and all is well.
I recommend just double checking the cable. If you have access to a continuity tester it might be worth while checking if those centre 9 pins are actually connected to anything. I would be willing to bet that they are not!
Best 'o luck though....
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