Desktop displayed but getting error "Device not attached"

Hi there,

I am having the followig problem. When I plug my rift in, my deskop is beeing displayed on the rift,
but the configuration utility says "No device attached". I uninstalled/installed Oculus SDK
v0.4.2 Beta a couple of times, but nothing changed. Then I tried using Oculus SDK
v0.4.3 Beta but the problem remains.The Tuscany Demo is displayed as well but of course it does not detect any
head motion.

My Specs:
Win 7 64-Bit
Dell XPS 15 9530

Graphics:
Intel HD 4600 on board
nVidia GeForce GT 750M


Thanks a lot!

Adrian