I forgot to mention that, as a last resort, I have already tried disconnecting & turning upside down & shaking, etc. This had been posted & seemed to correct the problem for others, not me, though.
Thanks in advance.
I had a similar problem: paper could feed through, but I would get a paper jam message. I found a small sensor which was bent, and when I bent it back the other way, I was able to print.
Open the printer (lifting the scanner) as you would to change the ink cartridge. If the printer were a football field, the sensor would be on the right side, forty yard-line. It is a long, black, plastic arm that sits in a channel between two paper guides directly below the metal rod on which the cartridge slides.. When I opened my printer, the sensor was bent up and out of the channel, and was stuck on top of the paper guide. With tweezers, then a flathead screwdriver, I was able to gently lift the sensor up and over the edge of the paper guide, and fit it back into the channel. The sensor is still bent--no longer centered in the channel--but it no longer blocks the movement of the ink cartridge, and I was able to print.
Since the sensor is still bent, I still get a paper jam error from time to time, but I just prop up the scanner, put some pressure on the sensor again, and it prints for me.
It was a very frustrating process to find the answer to my printer's paper jam problem, so I hope this works for you.