I have a AMD FirePro V4900 (ATI FireGL) in a Dell T3500 running Win7 64-bit. I have two Eizo CE240W monitors connect to each of the two displayport connectors on the V4900 and one Eizo CE240W connected to the DVI connector. The two displayport monitors are fine, but I get no signal form the DVI connector. I swapped monitors to confirm that there was no problems any of the three. What do I need to do to get a signal to the third monitor?