I set up my mini server with my old dell 2007 mon. I then bought a mini dp to dp cable for my dell2711 mon. If I connect only the 2711, I just get a blank screen. If i connect my 2007 as well via the hdmi to dvi adapter, the 2711 would display 1680x1200 (same res. as the 2007). After playing with it, I got the 2711 to run at 2560x1440. However, it is back the square one after a reboot. What did I do wrong?