Just to let you know. I have strange issue with latest SDK. Comp it loading without Rift connected (no hdmi or usb cables), but service icon has no red cross. And if I press Win+P and select "extended" or "only external" I will get empty or turned off main monitor respectively. Also if I select "clone" mode it will change resolution on main monitor to something like Rift has.
So it seems that OS thinks I have two monitors connected?! But I have only 1. Still Nvidia settings is showing only one monitor.
Could it be that virtual Rift monitor driver detected as a second primary monitor? It is not big dial. Just to inform you.