I have a Dell Latitude E6410 laptop with a GTX 760 attached to it via an Exp GDC external graphics card dock. it worked well for about 6 months but suddenly doesn't work anymore. When I start my computer with the dock plugged in the GPU fan will spin at normal speed and the docks green LED turns on but nothing shows up on the external monitor and the GPU doesn't show up in device manager. I've checked to make sure that all the cables are plugged in properly and none of them have a short in them. Please help, I really wanna play my bideo games.