Wilma, grab a multimeter and pop the cover on the microwave. Make sure it's unplugged! There should be 2 or 3 microswitches that are near the door mechanism. If I remember correctly 2 of them are in series, not sure. The main thing is, check them for continuity, make sure they're making and breaking contact properly. I still have the 1st microwave I ever bought, 1989 I think. I've had microswitches fail 2 times in all the years. I replaced the bad one and away we go. It may not be the switches in yours, but worth the check.
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Mark
1966 L72, 4spd Caprice
1974 Z28, M40 Camaro
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