Strange distoration.

Probably neither.
Did you change your contrast/brightness/gamma etc in windows when using the old cable?
 
Negative. I'm messing with those settings now from the Nvidia control panel. It goes away when I make the screen darker...but then it's to dark. After playing around with them I'm seeing a big difference.
 
Maybe there is another util running on your system that is also changing the colour/brightness etc balance ?
 
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