I have the exact same issue.
It worked for about 2 weeks, I was playing happily through ME3 in glorious 3d, shut my computer down, went to bed.
Turned it on the next morning, and nothing whatsoever from the display port.
The odd thing is, when the PC powers up, the monitor stand menu briefly lights up, also in windows, if you use the nvidia control panel and try Rigourous Detection, the menu panel also lights up again along with the message "Display Port" appearing on screen which suggests to me that something is happening, but why it doesnt actually work... I have no clue.
post edited by silvren999 - Sunday, March 11, 2012 12:07 AM