Daughter's Chromebook is about a year or so old and the keyboard has stopped working properly. Some keys work, others don't. Type the letter K and get Ki, type the letter s and get sxw, type the letter T and get nothing, and so forth. Tried the Refresh+Power thing but that failed to work. At one point thje keyboard began operating without being touched (!) which suggests a stuck button but couldn't tell which. We're wide open to suggestions.