Whirlpool Gold No power

My microwave completely died and has no power. I called a repair tech and was told that the Control Board was bad and needed to be replaced. I did that and it is still dead. The tech says I need to replace the entire over the range unit which is going to be costly.

I know that the fuses are good and it is obviously not the control board.

What could cause the entire unit to have no power?

Thank you in advance for your help.