Checked the three door switches; used ohm meter to see if there was resistance or if a switch was bad. 2 out of 3 switches showed resistance with the ohm meter. The last one tested (of course the last one) NO (normally open) did not show resistance; I.e. the ohm meter reading did not change when the switch was depressed. Appliance parts pros was the only company that had the same model number I was looking for (SZW-V16-FD-63). I ordered the relay switch, 2 days later it arrived (regular shipping). I installed it and the microwave is back working great. A little time, Internet searching and you tube video watching and <$10 later I have a working microwave. Much better than the $280 warranty plan Samsung tried to sell me to have a repair person coming and fix the microwave.
<10 minutes to replace the relay switch, 2+ hours to figure out exactly what the problem was. My recommendation is; if you have power to the computer display and the clock counts down when you start it. Check the door relay switches. You will read online a lot about capacitors failing, if there is power it is likely not the capacitor, check the door switches.