When a microwave oven refuses to turn on or show any display lights, resetting or restoring power involves checking the electrical supply path. First, verify that the power cord is plugged securely into a working wall outlet. Second, check your home electrical service panel to determine if a circuit breaker has tripped due to an overload. Third, unplug the unit for two minutes to clear any internal logic freezes. You can troubleshoot electrical power safely using a digital multimeter. You can verify that your corrective action is successful when plugging the cord in tightly, resetting the tripped circuit breaker, or replacing a blown thermal fuse restores full power, lighting up the digital display.
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