Dell E2414H Won't connect to new Laptop

I have a Dell E2414H.

I have been connecting it to my Sager listed below for a couple years via a DVI-miniDP cable. I have two cables and both cables work.

I just purchased an Aero 15 (LOVE), and when I plug the monitor into the miniDP port there the computer doesn't recognize it. This nonrecognition happens with no other devices plugged in, and even booting with monitor plugged in.

I have a second monitor that I can successfully connect to the Gigabyte via miniDP.

Any ideas? This...

Dell E2414H Won't connect to new Laptop

Dell E2414H Won't connect to new Laptop