Electrical wall outlets in a single room can stop working due to several common electrical faults, most notably a tripped circuit breaker in the service panel, a tripped upstream Ground Fault Circuit Interrupter (GFCI) outlet, or loose wire terminal connections. Over time, continuous thermal expansion and contraction from plugging and unplugging devices can cause wire connections attached to receptacle side screws or back-stab holes to loosen and break electrical continuity. Furthermore, a short circuit in a plugged-in lamp can trip the breaker. You can troubleshoot outlet failures safely by shutting off power at the breaker before opening wall plates. You can verify that your corrective action is successful when resetting a tripped breaker, pushing the reset button on an upstream GFCI receptacle, or tightening loose wire terminal screws restores steady voltage to all outlets in the room.
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