Microwave oven has no power on and the fuse is good. Power from the outlet is also good.
What part has failed?
You will want to check to see if there is power getting to the control board. If there is no power to the control board then one of the thermal cutoffs in the unit has failed and you will want to check each thermal fuse for continuity. If no continuity then the part is faulty and would need to be replaced.
My oven temp is about 20 degrees off. What do I NEED.
You will want to check the owners manual to see if there is a temperature adjustment that can be made. Also if there is not then the oven sensor would be the issue.