Microwave won't operate

Question

I used the Menu Planner function for the first time, made my selection & pushed Start. Midway thru the cooking time I pushed Pause/Stop to check how things were going and it would not work after that. No lites inside - nothing! I unplugged it at the power source, waited 15 mins. & plugged it back in & turned on the power! Again nothing except this time the digital display window came on with the usual request to set the clock!
Still won't work & still no inside lite!