Microwave Fan won't shut off, no display

Question

Hi.. we were cooking in the oven below our microwave and the a little in the microwave when the entire microwave shut off all power, except the fan kicked on and will not turn off. We let it run for about 5 hours or so and no lights ever came back on or it never shut off. We unplugged it for days, but once we plug it back in the fan kicks on again and there is still no disply power. Any ideas?