Hello. Welcome to Just Answer. Please allow me to assist you with your question today. I am John, I will do my very best to help you solve this problem.Have you removed the toner as well? What kind of paper got stuck and caused the paper jam?
OK, it seems you checked everything already. Did you open the back door by any chance? If you didn't, open it and follow page 89 of the manual (Click HERE to download it)
If everything is OK there also, then something was probably broken or a paper jam sensor got defective, unfortunately. In that case you will need to replace or repair the printer. If it is still in warranty, you will receive a new one for free, otherwise it would probably be cheaper to buy a new one.
Please let me know if you checked the back of the unit already and opened the section inside as explained in page 89.
If you are not satisfied with the printer, please do not shot the messenger.
Please keep me posted, I would like to know if you checked the back or not.