Sharp R-1502 Microwave Oven "wont start run press" Questions

...run, and the microwave still wont heat. What could be the problem? Is it possible for the magnetron to still pass the continuity test, but not be able to produce the necessary heat? Could it be the ...

...start buttton, but the unit doesnt run and the turntable doesnt turn. One very common problem is one of the door switches being bad. Most manufacturers these days use wswitches with very small 3/16 ...