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To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please
include your brand name and the full model number from the tag in or on
the unit, as well your symptoms "Microwave turns on for 5 seconds, then shuts off".
Please also not whether the display stays on or shuts off.
The object you're describing is the waveguide cover. It needs to stay clean and secure. If it's damaged, it will need to be replaced.
It provides critical
protection for the magnetron.
Just checked the GE website. Had the same problem with my 5 year old microwave. GE website says to close and open the door quickly three times. First time I did this it didn't work. Second time I closed the door with some significant force and reopened it more quickly. Worked. Unplugged the microwave, plugged it back in, still fine.