I think you have to set the monitors to receive their signal through their DVI port, not VGA. That's probably why it's saying "Analog No signal!" since they're not getting anything through their VGA ports.
I had the same problem with the same video card. I switched the monitor to digital: still no result. THEN I took out the video card and put it back in and tried again, and to my surprise, it worked (DVI output came through to the monitor)! I guess the Nvidia card needed its default output changed, or it just needed to be reset.