The model is an HP Office Jet Pro 1170CXI.
Impatient people pulled the jammed paper out of the printer instead of using the correct buttons (select/Resume) to forward or reverse the roller to remove the paper.
From the retrieved paper, it looks like there may be two little pieces stuck somewhere inside. They cannot be seen nor do they come out using the buttons or removing the tray, etc. We have also tried turning it off and unplugging it to try and reset the memory. The paper feed jam message continues to scroll when we turn it back on.
The booklet says that if we can