When exactly half of the electrical outlets in a room, hallway, or home stop working simultaneously while the other half continue to function normally, it usually indicates a tripped double-pole circuit breaker, a lost phase in the main electrical service panel, or a loose wire connection on an upstream duplex receptacle. In North American split-phase electrical systems, homes receive two separate 120-volt hot legs from the utility transformer; if one leg drops or a breaker trips halfway, precisely half of the circuits lose power. You can troubleshoot electrical power losses safely using a digital multimeter. You can verify that your corrective action is successful when resetting a tripped breaker or securing loose terminal wiring restores full 120-volt electrical voltage to all affected dead outlets across the house.
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