I just bought an NEC PA271W (2560x1440) to compliment my 30" ACD a Dell 2407 (1920x1200). I have the ACD on the DVI port and the other two on the Mini Displayports. Only the ACD and one of the other two monitors are live. What am I missing? Is the card not caple of supporting three displays? If that's the case, why the heck does it have three inputs!?