Keyboard will not respond to key strokes. I have windows 10 (installed on July 30, 2015) and everything was fine with the computer and keyboard and it suddenly stopped working. Every key I push...there is an unusual, quiet clicking sound. The Laptop is a dell 1737 (I believe) and has a touch screen. The touchscreen works and I can type on the touch screen with the on screen keyboard. The back lights on the keyboard work fine. Any suggestions? Teri