The answer to 'my recessed lighting won't turn on' is that there are several common causes, including a tripped circuit breaker, a burned-out light bulb, or a problem with the electrical wiring or light fixture itself. Symptoms may include the lights not turning on at all or flickering intermittently.
To troubleshoot, first check the circuit breaker to make sure it hasn't tripped. If the breaker is fine, replace the light bulb to see if that resolves the issue. If the problem persists, it may be due to a wiring issue or a problem with the light fixture itself. In these cases, it's best to call a licensed electrician to diagnose and fix the problem, as electrical work can be dangerous for DIY homeowners.