My microwave stopped working you can input time but when you push start nothing happens it has power and everything just will not start its like the start button does not work

1200 watt input and 700 output makes it 700 watt machine.
sounds like tThe touch pad is finicky . Yes , you are stuck with it unless you wish to replace the touckh pad.

They claim to have parts for Mezzo:
spares.bigwarehouse.com.au

Carefully verify the door micro switches.

I think you are right on the money, the keypad control board is vital to the operation of the microwave oven, if the problem cannot be resolved it will require a complete replacement of the above mentioned part, unfortuneately cost should be considered.

@William Miller - where are you located if i'm interested in your help with the microwave repair? I'm having the similar issue with the Start buton not working for my Panasonic NNSD697SS. Thanks

It sounds like it could be just a bad crimp connector supplying power to the whole system, which would have to be the fuse holder on the mains input panel.
Worth a look!

the switch contacts are not making so switch is u/s

thats what the express does its a one button start it
there s nothing wrong with the unit it is doing exactly what is programmed for what you are pushing

cheak fuse inside ok

The most common suspect here is a shorted high voltage capacitor, since you say it blew the fuse right after Start, but I would certainly suggest checking the door switches and door switch mounts first. Just be sure you installed the right fuse. It would be a The switch mounts seem to break at about this point in the life of these models. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://www3.sears.com (the three is correct)