The answer to 'my ceiling fan won't turn on' is that there are several common causes, including a tripped circuit breaker, a faulty wall switch, a loose connection, or a problem with the fan's motor. Symptoms may include the fan not spinning at all or making a humming noise without turning.
To troubleshoot, first check the circuit breaker and reset it if tripped. Next, inspect the wall switch and connections to ensure they are secure. If those are working, the issue may be with the fan's internal components, which would require a professional electrician to diagnose and repair.