Well, I got off last night from rifting, and shut down my PC (as I do every night), and windows had updates to install. Usually this wouldn't be a problem but when I got on the next day I started up my computer and it resulted in a blank screen. After much trial and error and troubleshooting, I turned on my Rift DevKit and untwisted the lenses and the windows help center (or w/e) wanted to run a system recovery. After a bit of time it resulted in telling me that I needed to unplug any recently usb inserted devices (cameras, flashdr, etc.). All I had plugged into my motherboard was my monitor, my mouse, keyboard, and the Oculus Rift. Of course after removing the Rift, it worked fine, but I thought I should probably post this before anyone else has this problem. Sorry if this has been reported before. I have Windows x64.