If the microwave has no power, this can sometimes be resolved by checking the outlet or circuit breaker.
Turn the circuit breaker to the microwave off and back on.
Check that the microwave's power cord is plugged in to the outlet securely, and hasn't come loose. If the microwave still has no power, test the outlet with another small appliance such as a hair dryer or alarm clock. If the alternate device has power, the microwave will require repair service.
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If the alternate device does not power on, this indicates that the outlet is not receiving power. A certified Electrician will need to be contacted to check the outlet.