I'm using a dell E-port plus 2 with a with a dell latitude E5540. I'm attempting to connect an external monitor via display port and I'm not getting any video. Every time I turn on the monitor I get “entering power saving mode” which is making me want to toss these monitors out the window. I've already switched display settings to extended monitor, changed the resolution, power cycled, etc... The monitor model is dell u2414h. Unfortunately I need to use display port for it is the only cables I have available for this project that I am working on. Any thoughts?