I am trying to connect my new HP A450n to my Dell 20" flat panel. I have the cord that came with the Dell. It' has white connectors on both ends and they are the same type connector. I can locate the DVI input on both the CPU and the monitor, but when I connect them, I get a blank screen or a VGA test screen. What am I doing wrong? Does the monitor need to be "set up" for DVI or maybe it's the CPU? Can anyone help me?