I'm running Karmic Koala. My keyboard has been working fine, but I just booted up and I can't type the "x" key. I don't think I've changed anything since it worked. I went to System > Preferences > Keyboard > Layout and it's set to the default. My exact keyboard isn't listed, but similar sounding layouts didn't work. I'm using a Microsoft (maybe here's my problem =]) Natural Ergonomic Keyboard 4000 v1.0. I have no idea where to start. Any ideas?