When the display is blank and nothing responds, the fault is in the power path.
Check the Outlet and Breaker
Microwaves draw heavily and can trip a breaker or GFCI.
Fix: Test the outlet with another device and reset the breaker.
Door Switch Interlock
A failed interlock can cut power entirely as a safety measure.
Fix: A technician tests and replaces the switch.
Internal Line Fuse
A surge or a fault can blow the internal ceramic fuse, killing all power.
Fix: This is a guided repair — the capacitor must be discharged first.
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