Windows Function keys have long been used due to its convenience. People use them to change brightness, enter help center and adjust audio volume, open wireless network, print screen, insert words, etc. But all of a sudden, you find these F keys (F1~F12) are out of work or part of them out of work and you are unable to perform some actions with them on your Dell, Lenovo, and Toshiba laptop. Solutions: 1: Unlock Fn Key or F Lock Key 2: Uninstall Keyboard Drivers 3: Update Keyboard Driver 4: Disable...