It went completely dead when I opened the door to adjust the plate of food that was inside.
It's probably the internal fuse.You will have to take the microwave down so you can remove the housing to get at the fuse.(I will probably install an accessable panel mounted fuse holder if this ever happens to mine-already did it on the little microwave I carry around on my work truck to heat up my lunch).
SOURCE: replacing door handle
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The choke cover (or door gasket on your brand) will come out similar to the diagram shown below.
Then the hidden screws should be visible.
Also, you can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
SOURCE: Dead Microwave
Remove the top cover of oven, there should be tec screws on the bottem of unit to remove the cover, check for bad relays,fuses and fuseable links that could have finaly gone bad.
SOURCE: microwave completely dead
A microwave can be dead for many reasons.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.
If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.
If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
We're happy to help and we appreciate your thoughtful rating of our answer.
SOURCE: need installation instructions Maytag Over the Range Microwave MM
The operating manual is at;
http://www.amroyal.com/pdf/mmv4205_manual.pdf
Installation instructions are at;
http://shared.whirlpoolcorp.com/assets/pdfs/literature/Installation%20Instructions%20-%208101P710-60.pdf
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