It consistently starts to print and then

Hello sir; Check the carriage shaft (cross bar) the other end of the ink seat, got to have something block their way, clear up !

I would say just turn this printer off and unplug it for an hour or so. Then see what it does when you turn it back on. If it still says clear paper jam then maybe there is a small piece of paper that you haven't found yet that the sensors are still seeing.

Check and clear any unfinished print jobs before turning the printer back on. Control panel>>>>printers >>>>then right click on your printer(hpofficejet 6210) properties-cancel print jobs

Hope this helps!