I have an external AOC USB 3 monitor called E1659F WU, this connects fine with the Surface Pro 2, but when I try to connect it with the Surface Pro 3 it just blinks and I get that USB connection beep over and over and over again. I have tried connecting an external battery pack as well, just to make sure there is enough current for the monitor (it comes with a Y-cable). Why will it work with the older but not the newer model?