When all electrical wall outlets in a single room stop working simultaneously, it points to a disruption in the branch circuit supplying that specific area. The most frequent cause is a tripped circuit breaker in your main service panel corresponding to that room. Another common cause is a tripped upstream Ground Fault Circuit Interrupter (GFCI) receptacle located in a bathroom, kitchen, or garage that protects downstream outlets in other rooms. Additionally, a loose wire nut connection inside the first outlet box of the room's daisy-chain configuration can sever power to all subsequent outlets. 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 a tripped GFCI receptacle, or securing loose wire terminal screws restores steady voltage to all outlets in the room.
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