I recently received my Rift and I have been attempting to run various demos. TF2 and HL2 both work perfectly, and neither required any kind of configuration. However, when I run the official demos or VIREIO, the Rift screen goes black and briefly shows a blue screen reading "No Signal" in the right eye. I have read through the various threads here and nothing has worked for me so far.
I am hoping that there is some simple configuration step I missed, in which case I apologize for being a dunce. Please help!