Connecting a Dell U3014 monitor to a Mac Pro

Just got the Mac Pro and the Dell U3014 monitor. I'm using DP / MDP cable that came with the monitor, connecting to a TB port in the Mac Pro. The message I receive in the monitor is " No display port cable". Help anyone?
Thanks!

See:
http://www.ireckon.net/2013/03/force-rgb-mode-in-mac-os-x-to-fix-the-picture-qua lity-of-an-external-monitor/comment-page-1#comments
and
Re: Blurry Text On Dell UltraSharp U3014
chilly7 wrote:
what is ruby script?

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Connecting a Dell U3014 monitor to a Mac Pro

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