If your keyboard keys stop working, it doesn't necessarily mean they're broken or need replacement. From checking keyboard ...

Open the MacBook with the keyboard facing you at a 90-degree angle, and tilt it backward slightly. Spray compressed air left and right around the stuck key. While you're at it, you may want to do a ...

Before troubleshooting the problem, make sure the issue isn't hardware-related. Keys may stop working if they're stuck, physically damaged (such as after a drop), or if the keyboard connection is ...