A laptop keyboard can stop working at anytime and include symptoms such as the keys on the keyboard not working, the keyboard not working at all, or the laptop not even booting up. A keyboard fault can prevent a laptop from booting up. The reason why this happens is usually because the keyboard has an electronic circuit that converts the pressed key information into the binary code, which is then sent to the motherboard. If there is liquid damage to the keyboard and the circuits get damaged and stop working, this can also prevent a laptop from booting up or switching on altogether.