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I see that you have done wonderfully in troubleshooting this on your own. You have done just about everything that I would have told you to do.
Personally, as an IT person, I would take the printer, if I could lift it. Pull out all the loose parts that I could put back in, turn the thing upside down and shake the heck out of it. A lot of times there are objects in the machine that we can't see. Especially if it is used communally. If you are able to do that, go right ahead. It WILL NOT hurt anything if you do.
Another thing I would try myself after shaking it out, I would leave it off and unplugged for about 15 minutes. This clears out any static in the system and will reset any information in the boards.
The only other thing I can offer is to follow the instructions for clearing paper jams on the HP website. You can CLICK HERE to view the instructions and even view a video.
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Were you able to resolve this?