@martharhoads first you need to make sure you actually have power go to the Air Fryer and check the components on the circuit board as well as the safety switch. A broken safety switch will prevent it from coming on. Use this guide [guide|160047] to work on it. Once you get to the circuit board, post a couple of good pictures of your board with your Question. That way we can see what you see and hopefully assist you in finding anything on that board which may be the cause for this.