zanussi electric cooker zce7610w?

My Zanoussi double oven & ceramic hobs stand alone cooker worked fine for over a year. However, we had guests last month and I had to use the four rings at the same time. I had the three rings on but as soon as I switched on the fourth ring. I hear a small explosion sound inside the cooker and the whole light in the kitchen went off. I checked the fuse box and I found that the circuit breaker for the cooker off. I flipped it back to on again. Now the whole cooker is out of order ie if I switch on any ring or oven , the circuit breaker switches off- it looks like the cooker have a major short circuit. Any suggestion or help on how to bring the cooker back to life, would be appreciated