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If you have tried to reset the microwave oven by turning the mains power off and on without success then it is likely the display is faulty.
The only way to repair is replace the control panel board. This can cost a lot of money.
You need to uas a 7 inch duct to duct it out. You can get all the info you need in the manual on the link below. Please give it some time to load. If you need parts you can call Sears at 1-800-4-MY-HOME.
If you're getting 120V at the lampholders, yet it's not lighting lamps that still work perfectly well in other fittings, two possibilitiesspring to mind.
One is that the cap on the bulbs isn't quite compatible with the fitting. Assuming they're some variant of Edison Screw, make sure that the centre terminal in the lampholder is sticking out far enough to touch the terminal on the bulb. Also check whether the lampholder achieves it's outer connection just with a small tab, rather than with the whole of the threaded ring. If so, make sure that this is going to touch the appropriate part of the bulb.
The other possibility is that you've got a high resistance connection somewhere - not enough of an open circuit to drop the 120 V when feeding the Megohm load presented by a meter, but more than enough to kill the supply when you have a lamp load. Only way to chase this is to use the meter on ohms range to bell out all the wiring between the lampholders and bits of the system which do work properly.
If you have 120VAC on the center contact of the light socket, and a working fan, but the bulb won't light...the most likely cause would be a disconnected neutral wire (white) in the light wiring inside the hood....assuming everything else is wired correctly.
If you're comfortable with further electrical testing...let me know, and I can describe a detailed procedure to check the status of the neutral wire. Otherwise, you may need the assistance of someone familiar with electrical troubleshooting or appliance repair.