Product review (5 stars): Fuse Cheaper Than Repairman!
Our microwave went out and before calling a technician or buying a new one, I looked online at possible causes.  I found out there is a fuse inside the case that may be bad.  I pulled the microwave out of the wall, removed the case, found the fuse and tested it and it was bad.  Found this fuse on Amazon at a very low price and had it in a couple of days.  All is fine.