Almost always when single keys fail at work (I am not a tech wizard but manage our IT) it is because of a dirty keyboard. Everything bagels are deadly to keyboards.... Anyway, get a can of compressed air and clean out under the keys also a quick fix...turn the key board over and GENTLY tap on the back to clear any debris under the keys...NO water...No household spray cleaner. I get the best looks from the smartest people when I give the keyboard a couple of taps or a quick air spray and the problem is fixed...awesome Good Luck...KMQ