Microwave completely dead – no display, no lights, no response when buttons are pressed.

Safety first: Unplug the microwave before any inspection. Internal fuses and thermal devices are safety-critical; never bypass them.

Step-by-step checks:

• 1. Check outlet: Plug another appliance into the same outlet to verify power. Reset any tripped breaker or GFCI.
• 2. Inspect power cord: Look for visible damage, cuts, or burn marks. If damaged, the cord must be replaced by a qualified technician.
• 3. Internal fuse (experienced DIYers): Remove the outer cabinet. Locate the line fuse near the power cord entry. Test with a multimeter for continuity. If blown, investigate for underlying causes (shorts, door switch faults) before replacing with the exact same rating.
• 4. Check thermal fuses: Locate cavity and transformer thermal fuses and test for continuity. Replace any open fuse with an OEM part of identical rating.
• 5. Control board: If fuses and thermals are good but the unit is still dead, the control board's power supply is likely faulty and the board should be replaced.