Problem w/ two 27" LED Cinema Displays on ATI 5770 MacPro

Attempting to connect a second display to a mid 2010 Mac Pro. There are two mini-ports + a DVI on the 5770 card. Currently I have a single 27" LED connected using one of the mini ports. The computer isn't recognizing the second monitor in the other mini port. I used to have an older 24" LCD Cinema display running successfully, using the DVI port on card with a powered adapter. That configuration isn't doable with a newer 27" given the output from it (not the older style video cabling, but rather the mini display port. Would appreciate any suggestions on how to get the two 27" monitors running together.

Hey turbostar, finally a chance to get back to you, sorry about the delay.
I had already tried both ports with no success on the second monitor, but when I moved the primary monitor to the second port and it worked... it it got me to thinking maybe the power outlet was bad if not the monitor itself. Indeed that was the issue. The second monitor was plugged into a power strip in which one of the six outlets on it was not working. Replaced the surge power strip with a new one and all is good.
Thank you for your time and help.

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