Whirlpool gas oven won't heat

Our gas oven won’t heat up (at all). Seemed to have gone out in the middle of cooking dinner. The control panel was replaced about 2 years ago and everything appears to be operational. When I set the oven to bake I hear something kick in (maybe the fan:confused:) but no heat. The gas range top burners work fine. Is this something we can fix ourselves or will we need to call in the big-guns?

Any ideas?

thanks!