Thunderbolt displays don't work with Mac Pro

Hello,
I got today a brand new Mac Pro with 2 thunderbolt displays.
Both displays stay black when I try to connect them on any ot the 4 ports.
Old displays work on the normal port.
Why does new Mac Pro with new 2 thunderbolt displays don't work?
Thanks.

If you can just wait until next year, Time Cook is promising a totally re-vamped Mac Pro which I have to assume will have TB ports.
My only worry is that today (Oct. 23) in the whole new slew of gadgets, Apple will introduce a new TB Display, compete with USB 3.0 ports, ant-glare screens, etc.
Sigh - you live with the technology that you paid for...
Clinton

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<http://www.amazon.com/DVI-D-Male-Dual-Link-Cable/dp/B003QNDEGA>
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Thunderbolt displays don't work with Mac Pro

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