I was happily working away on my main computer, a Dell desktop, probably 4-5 years of age. I took a break, probably 15 minutes and when I got back I noticed that I could not type. I have a new Logitech K800 that up to today worked fine. From another computer, the one I am on right now I switched the mouse and keyboard to the Dell. Same thing it won't type. I plugged the USB's directly into the computer and no change. Of I tried restarting and because of that I can now not log in, because I can't type. Up to this point when the computer was still on it searched and acted normal.....but would not type. Anyone have any ideas? The Logitech is an illuminated keyboard and it was not illuminated. But it's disconnected now and no typing.