oven won't swith one?

I have a belling multifunction formula oven. My girlfriend left the full grill on full power after she had cooked some dinner. By the time I realsied it was left on everything was very hot to touch to turn it off.
Since then I have tried to start the oven but it will not come on also the LCD is no longeer displaying the time. Does anyone know what may have broke from the overheating to try to fix this problem?