whirlpool 2000+ oven/timer problem?

My oven has been working well even with out the timer for years, however recently I am unable to use the oven beacuse the timer button was nudged whilst cooking last week. The button still appears to work normally and I have tried to reset the timer by selecting either the On, Off or manual settings and still the oven fails to warm up no matter what is selected by the timer button(s). Therefore I ask...
Is it possible to bypass the timer?
Is there a fuse I dont know about?
Do I need to dismantle the whole unit to do it ? or
Do I need a qualified and certified electrician to condem it and make me buy a new unit ! as everything else seems to end up with me shelling out bucket loads of money
ps very fed up with salad now!