I too have a HP 8600 plus, which I've been owing for several years now without a problem. Today, out of no where in the midst of printing, I get a message stating "paper jam", after searching FOREVER for this paper jam that didn't exist. I turn my unit back on and am greeted with the new message stating "improper shutdown". Yep you all know the drill, I click "ok" and back pops up the "clear paper jam" message again. I search online and try all the cleaning, disconnecting the printer for 30 mins from the wall, as well as all the other recommendations out there. NOTHING WORKS.. Now I notice my ink cartridges doesn't want to move like it normally would, but will move perfectly fine with my hand gently pushing it back and forth from side to side. One of the recommendations said to do a network reset, which I struggled to do opening and closing the front panel enough times to quickly be able to click the option "restore network setting". MISTAKE.... Now not only can I not clear my printer of the stupid error messages, now my computer won't talk to my printer. Can anyone help asap?? I can not be without a printer and will need to purchase a new one tomorrow if I can't get this fixed tonight.