Well, I have both a wired USB, and wireless Logitech keyboard that worked fine a short time ago, and now neither work. I was using a Logitech wireless k520 in combo with an m310 mouse no issues. Now the mouse works fine, but keyboard is not. Tried fresh batteries, restating comp, etc. I removed the wireless USB transmitter and got out my trusty dell USB keyboard, and wired mouse. Mouse works fine, again no go on keyboard. Nothing is working, and not sure what is going on. I cannot get into set up or safe mode without some kind of keyboard so I am at a loss. Thanks in advance for any help/advice.