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Originally Posted by Glinda
Interesting. And yet, I've never met one person in my 60 years whose entire house full of electronics/appliances was permanently damaged by a power surge.
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That sentence had a typo. It should have read
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Household wiring has irrelevance - unless you can cite something so glaring unique to explain it. If it was a surge, it was incoming on every wire.
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Also noted: numbers (for a surge) can vary significantly even in the same town. Geology is one major factor in creating / avoiding risk. Even a nearby transcontinental pipeline can make surge damage easier. Surges are either consumed by appliances as if electricity; or do catastrophic (permanent) damage. No reason exists to believe a surge existed.
If a surge exists, it is incoming to everything. Is everything damaged? Of course not. That surge is hunting for best connections to an outgoing path - earth ground. So everything has a surge incoming. And some (multiple) items are a best outgoing and destructive path. Their destruction is what protected other appliances. Their damage indicates that a homeowner all but invited that surge inside. How many other appliances were damaged?
Most failures (that get blamed on surges) are actually manufacturing defects. Nobody can say anything more until catastrophically destroyed internal parts are identified; the destructive incoming and outgoing path identified.
But you clearly did not have a surge - since no damaged appliances are identified. And since surges never create what was observed in that microwave. Move on to other far more likely suspects.
Again, to say more, provide that information. No honest recommendation is possible until a problem is first confirmed.
Not even identified is that microwave's design year - 1970, 1973, 1976, or 1979 technology. Not identified are any other appliance in safety lockout mode. Even the resulting behavior of each display (clock) still is not listed. Technologies changed that much in that period - another relevant fact that remains withheld. Do you want a solution?