If only one room loses power, the problem is most likely limited to one circuit, a tripped breaker, an upstream GFCI, or a failed connection. Do not open energized electrical boxes to investigate it.
Map what lost power
Note whether lights, outlets, or both are dead and whether an adjacent room shares part of the outage. That map helps identify the affected circuit.
Check the breaker and GFCI without disassembly
Reset a breaker only once and look for upstream ground-fault protection devices in bathrooms, kitchens, garages, or outdoors where applicable.
Stop if protection trips again
Repeated tripping means the cause is still present. Unplug loads on the circuit and leave the breaker off if it will not stay reset.
Odor, heat, or sparks need prompt attention
A hot switch, outlet, or wall, burning odor, or sparks are reasons to stop use and call an electrician. Do not remove covers to search for a loose connection.
Sources
- U.S. Consumer Product Safety Commission — Electrical Safety — Household electrical hazards, receptacles, wiring, breakers, and safe response.