Because of their exposure and constant use, keyboards are one of the more commonly needed laptop replacement parts. Even if the keyboard continues to function for a long time, it suffers cosmetic wear such as the lettering on they keys being worn off. Keyboards can also be damaged by a number of things including spilled drinks, pet hair, cigarette smoke residue or unusually high humidity. Exposure to these elements can cause keys to stick, pop off or simply stop working. These same elements can affect other parts of your PC as well, so we strongly recommend storing and using your notebook computer in a clean environment.