Oven will not turn on (by 4 users)

my oven temp. will not work but turning on the bake button gets it too hot when i set the thermostat it turns off

I have a sears slide-in electric range.All of a sudden the oven and the broiler will not work. The burners, timer and the clock work. I had the elements for the broiler and oven checked and they are fine. What could it be?

oven element burned out. I didn't know it was hard wired in the back. I pulled it out and got a large burn-out like fire works that shot out. Oops. Was told I should not have done that. Since then had someone take the element out, wires burned on back. Also since the fireworks, the top burners also quit. New element came in. Someone installed new element but still nothing works. Where are the fuses located or could I have burned everything out with the firework like display I had ?