Mac Mini5,3 Display port conectivity SAMSUNG U28D590D

Hi
New mac user here, I have a Mac Mini MC936B/A OS X Server Lion 10.7.5
Im using a Samsung U28D59D monitor, this works ok via HDMI at 50hz but i get no picture using the display port output from the mac.
I just get a blank screen, the monitor picks up a signal and comes out of power save but nothing displays.
I have comfirmed the display port works by connecting a PC to it.
What am I doing wrong?
Thanks in advance.

You may want to repost in the correct forum, this forum is an iMac forum.

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