20 Most Recent Staples TXC122ACC Cross-Cut Shredder; 12 Sheet - Page 6 Questions & Answers

If I understand the question then yes it should run on auto when the paper is inserted to be shredded. I have this shredder as well and mine is always set to auto.

Check to see if there's a little piece that broke off from the door. This would be the "safety interlock switch" or little thingy that pushes down the basket sensor. The basket sensor is located on the bottom front of the shredder. I bent a paper clip to hold down the metal switch (basket sensor) and taped it to the front of the shredder with scotch tape.

Is the shredder fully seated in the paper container, there is a switch there that must contact or the shredder will not work, it is a safety switch.

They get a lot of paper dust in the motor area