Carrie turned on her laptop and a few of her keys don't work anymore, so she can't log in. Leo says that may indicate that her keyboard is dead or that those keys have broken. The good news is that she can plug in a USB keyboard and use it that way. She could also pry up the key caps on her laptop keyboard and see if there's some dirt or lint in them. That can easily cause a lack of connection between the keys above and below. Canned air will get rid of all that.