Thank you Barry! I had this exact problem with my Kitchen-Aid microwave. Pressed the button to open the door and the lights went out on the microwave. Checked the microwave circuit breaker and it was good. Unplugged and plugged in still nothing. Checked ForeForums and found your post. Popped the panel off the front of the microwave and pulled the fuse. Used my ohm meter and found no continuity through the fuse. Checked on-line to see if Radio Shack still carried the fuse, they did. Checked for closest location, found several (we're in Denver). Checked for hours, found one open until 7:00pm on Sunday (it was 6:00pm). Called the store confirmed they had the fuse (4 for $3.49). Drove down and got the fuses. Drove home popped the fuse in and all is right with the world again!
Thanks again Barry and everyone else on this forum for all the help you've given. I'm pretty sure I would have divorced Big Agnes long ago without your help!
see ya
ken