When residential lighting fixtures go completely dark even though the circuit breakers in your main service panel remain firmly in the "On" position, the power loss points to a downstream break in electrical continuity. Common causes include a tripped upstream Ground Fault Circuit Interrupter (GFCI) receptacle that controls downstream lighting lines, a loose wire nut or terminal screw connection that has disconnected inside a junction box or switch enclosure, a burned-out branch wire, or a utility service drop issue. You can troubleshoot power failures safely. You can verify that your corrective action is successful when locating and resetting a tripped GFCI outlet, opening junction boxes to secure loose wire nuts, or restoring faulty connections brings the lighting circuit back to full operational status.
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