Microwave completely dead; no display, no lights, no response to keypad.

Safety: Turn off the circuit breaker before removing the microwave or opening any panels.

• Check household power: Verify the breaker for the microwave circuit is not tripped. Reset if necessary.
• Test outlet: Plug another appliance into the outlet to confirm power is present.
• Internal fuse (technician-level): If the outlet has power, an internal line fuse may be blown. Accessing and replacing this fuse requires removing the outer cover and working near high-voltage components.
• Root cause: A blown fuse usually indicates another fault (e.g., shorted door switch, shorted capacitor, or magnetron). A technician should diagnose and replace the failed component along with the fuse.

Recommendation: Because of shock risk and the need to identify the underlying cause, internal fuse replacement should be done by a qualified technician.