Different kind of paper jam....

Have the rollers replaced -Carl

Check the paper feed tray for bent papers. Also, try blowing over the sensors to clear any debris. Check for small pieces that may have been left behind. If all fails, unplug it from the outlet, then start it up. Good luck!

Hardware failure,Go for a new all-in-one

I have the same problem

lex is junk ...stay away from this brand ..try others but i recomend epson.good luck

Remove back part of the printer. View the printer roller usually in the heater area, if there is still small particles or paper left.

Good old 4MV.
paper jam is just the way the printer i stelling you "something" wrong with paper feed".
you need to locate a "4MV repair kit" , they are not cheap. but, if you wan to keep the printer, it is worth it.
http://www.fixyourownprinter.com/kits/hp/K78 cost of the ket is $50
includes Instruction CD rollers, and other repairable parts.

This is a widely known problem with this printer and means the formatter board needs to be replaced. Save yourself the cost and headache of repairing and move on. The problem initially began as a random situation where I would have to turn the printer off and back on to get it to print.This eventually progressed to the problem you all are reporting which is the amber toner and jam lights on. I replaced the formatter board on mine and after one month the problem returned with the new formatter board needing replaced as well.

Of course, HP acts as if they've never heard of the problem. This company's integrity and quality has gone from number 1 to dead last.

I had this totally annoying problem this morning. After looking for any obvious paper jams or small bits of loose paper, I tried several fixes: 1) open front cover, release levers that hold white rollbar in place, roll the bar forward to make sure nothing is stuck behind it, snap levers back in place; DID NOT fix the problem; 2) open top cover, remove print cartridge, look for jammed paper bits, close cover; DID NOT fix the problem; 3) unplug the machine, wait a few minutes, turn machine back on; DID NOT fix the problem. I even unplugged the machine, opened ALL the covers, turned the machine upside down and shake it to see if any paper clips, staples, or other objects have fallen inside the machine; DID NOT fix the problem. FINALLY, I pulled the paper feed tray forward, reached down to the feed rollers, twisted them a few turns, put paper back in the machine, and the "paper jam" message disappeared! This may not work for everyone, but it worked for me today, so I hope this helps someone out there to have a better day.

Hi, I can help you with your printer problem. Please open this document and follow the instructions to the letter. http://h10025.www1.hp.com/ewfrf/wc/fastFaqLiteDocument?lc=fi&cc=fi&dlc=fi&product=12019&docname=c00249509 Let me know how it goes. Good Luck