Unit not getting power

no plastic shield is required most of microwave oven comes with open light

That unit shows that it takes 15 or 20 AMPS to run. What is the breaker amperage on the circuit where it is plugged in? Is the breaker a GFCI? You can tell by looking for the two buttons on the circuit breaker or the outlet.

you need a new hv capacitor and a fuse

Remove unit and check trip/reset switch on unit. Double check GFCI receptacle with plug tester with GFCI test button.

No reset buttons or fuses. Find the circuit breakers for the unit, it should be a double breaker with at least 40 Amp rating. Push it to the off position HARD (make sure not to pull the breaker out of the panel doing that). Turn it back on. Check voltage in the range power outlet. It should measure 220-250 Volts between the right and left connectors, and 110-125 Volts between the center and each side connectors. If not - problem is in the wiring or breaker. If you get those voltages and the range is still not working - problem is in the range itself. Check for shorted and loose wires.

Make sure breaker isnt tripped. If breaker isnt tripped just for the sake of knowing plug a fan or something you know that works in the outlet. If it works, you have probably blown fuses in the microwave you'll have to take microwave apart to get to them.

• Make sure that the microwave is plugged into a grounded outlet. It must be a 3-prong outlet.
  
• Make sure the clock is set.
• Check to see if a programming sequence was entered. Sometimes improper programming or a program sequence such as delay start can cause the touch panel to be non-responsive. Unplug microwave or turn off house circuit breaker for 30 seconds. Plug back in, or reset circuit breaker, and try reprogramming unit.
  
• Check the house circuit breaker or fuse box. If the microwave is DEAD and there is no display and nothing works- the problem could be a blown fuse or tripped breaker.

TAKE OFF THE CABINET AND LOOK FOR A FUSE THAT IS MORE LIKELY GREY AND MADE OF CERAMIC IT IS SHAPED LIKE THE OLD GLASS AUTO FUSES. NO VISUAL (GOOD OR BAD) MUST BE TESTED WITH OHMMETER FOR CONTINUITY

The clue is that you have to reset the clock. You are losing power somehow. the Main Board thinks it is being unplugged and it resets the clock and you have to start all over. The fact that after so many times it will finally work tells me that whatever bad connection you have is finally getting hot enough to expand and make a good enough connection to keep working. Intermittant connections are the worse to find. A lot of trial and error to find the problem. can be bad fuse and fuse holder ( in the unit), bad outlet, loose wire at circuit breaker, loose wire at outlet. Even a loose breaker where it snaps onto the buss bar in the Breaker Box. Etc, it an really drive you nuts trying to find it. Try the unit in a totally different area making sure it is on a compleately different circuit breaker and see what it does, if the problem follows the unit, the problems is in the unit. If not, electrical problems, outlet, breaker, panel,

Sounds like the door switches are out of adjustment or broken. There is only one main fuse, so if you have a display, it must be OK. Could also be a failure in the high power that runs the magnatron plus the lamp.
I would take it to a shop for repair. Microwaves are almost always repaired affordably unless it is really old.
Hope ya fix it!