It is NOT advisable to open the top part off. Make sure that the door (bin) is closed properly or else your machine will not run. Apply vegetable oil (preferably from Fellowes too) across the paper entry and then feed a paper and then press and hold forward button for 3 seconds.
If that doesn't work then it is advisable to contact them regarding the issue:You can contact Fellowes here:
Clary Business Machines,
10360 Sorrento Valley Road, Suite C,
Toll Free:(800) 992-5279
Local Phone: (858) 552-0290Fellowes Support Website