I've had a problem. My electirc hob went bang. It tripped the trip switch for the oven and the hob. I've flipped the trip but now only the oven works and none of the four plates on the seperate hob work. I'm assuming the hob must be broken, is this likely to be the case? If so I guess I need a new one. Will I need a pro to fit it, because my step dad is an engineer who builds small subs and is pretty handy, so if it's just a case of replacing old for new he should be able to do it no?