So how is connected? You're not accidentally connecting it via the onboard HDMI or something silly?
My tips would be:
1) Connect it with the DVI cable supplied.
2) Ensure it's connected to the dual-link output on your graphics card...note that most cards (even with 2x DVI's) will only have 1x dual link connection
You won't get a picture if it's not connected via dual-link.
Windows re installed. One step forward but no cigar. The driver now has the much better selection of resolutions up to 1920 x 1200 with the monitor connected with DVI cable. However, there is still no display on the monitor. I also tried a mini display-port to DVI cable with the same result.
I then thought it could be that the monitor only accept dual link DVI so I tried a HDMI -> DVI adapter on a different PC with the same DVI cable and I get a display. As the HDMI only do 1920 x 1080, that is the resolution I got. So, it can use a single link source.
More research on Google is needed I think, but at least the proper resolutions come up in the driver this time. The main reason I need the laptop to connect on DVI is that I have an Aten 4 port dual link KVM on order, I have 3 other PCs that can output the full fat 2560 x 1440.