I have a XPS L702X laptop that is about 3 years old. It started making a beeping sound for the first time yesterday every time I press a key on the keypad when typing. It has never done this before. It makes this noise with the speaker muted and all sounds set to none. I have looked all over the place trying to find a way to turn off this annoying noise. Can anyone please tell me how I can shut this irritating noise off?