The answer to 'why is my junction box not working' is that there are several common causes, including a tripped circuit breaker, loose wiring connections, or a malfunctioning electrical component inside the junction box. The symptoms may include no power to the junction box, flickering lights, or buzzing or humming noises.
To troubleshoot, first check the circuit breaker and reset it if tripped. Then, carefully inspect the junction box for any loose or damaged wiring connections. If the connections look secure, the issue may be with an internal component like a faulty switch or outlet. In that case, it's best to call a licensed electrician, as junction box repairs often require specialized expertise and tools.