We got a new monitor today for one of our pairing workstations. At 2560x1600, it was higher resolution than its predecessor. I disconnected the DVI cable from the old monitor, leaving it connected to one of the video ports on the computer, and connected it to the new monitor. All I could see was static and noise on the screen. After trying a variety of other things, I eventually thought to use the DVI cable that came with the new monitor. It worked!
I had assumed that all DVI cables were interchangeable. Reading the Wikipedia article, I see that at higher resolutions, dual link is needed. I hadn’t known such a thing existed.