Oven not coming on but timer and lights working (by 2 users)

The door switches are almost certainly the culprit - probably the upper one. It may also be a loose mount, or even a loose spring in the hook-like devices on the door which activate the switches.

There is a center monitor switch whose purpose is to blow open the fuse if the door is open and the upper or lower switch gets activated.

That's why the fuse blew when the screwdriver was introduced - you activated the door switch while the monitor switch was on.

I've attached a generic picture which gives you the idea.

More importantly, at my Web site, I have critical safety information, disassembly tips, and infomration on checking and replacing door switches.

You can find these via my link at FixYa here: http://tinyurl.com/yzjozk