How can I get the grill and oven to work on my 3 year old electric cooker?

Hi,
2 nights ago, while using the grill (which is at the top inside of the oven) on my Hotpoint SY51X, the fuse box tripped. I reset the fuse box, but since then the grill and oven do not heat up. The fan and light are working, as is the thermostat light. Any idea what could be wrong, and would I be able to fix it?

Tracy
January 2011