Switch on top is bad
or control board is fried

Heres a few sites that have gears and parts
another that has manuals you may have to call or email as not all parts are listed on website


http://www.compax.com/shredders/parts.html

http://wheelermachines.com/manufacturer.html

http://www.manualsonline.com/ex/thread/view/idThread/1735067