When a single wall outlet stops working even though the corresponding circuit breaker in your main service panel remains firmly in the "On" position, the problem points to a downstream break in electrical continuity. Common causes include a loose wire nut or terminal screw connection inside the outlet box that has vibrated loose over time, a tripped upstream Ground Fault Circuit Interrupter (GFCI) receptacle that controls downstream outlets, a broken internal contact within the receptacle itself, or a severed branch wire. You can troubleshoot outlet failures safely by turning off power at the circuit breaker before inspection. You can verify that your corrective action is successful when locating and resetting an upstream GFCI outlet, opening the junction box to secure loose wire terminal screws, or replacing a defective receptacle restores normal power delivery.
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