By reversing a jammed credit card you've probably destroyed the switch lever that starts the shredder when you put in a document.
If you can find axsoirce of spares that includes the lever, and can buy it then, if you are that lucky, you should also go buy a lottery ticket as well.
I managed to repair something like this once, but I had to take the unit apart, get all the pieces of the lever and superglue it together after first drilling some 1mm holes and super gluing in some steel pins (actually bits of steel wire cut from paperclips).
It was a pain. Next time I'll just replace the shredder.
Ffsdtui
August 2025