Two things to try:-
At the back of the printer, is their a removable door hatch oblong shape, if yes open this and genlty see if you can move the rubber rollers. I am not sure if this model has this door so ignore if it doesn't.
Or pull out genlty the power cord to the machine when the printer is powered off. Then press the Power Button firm a few times. This will remove and static overcharge in the printers internal Power unit just incase this may be the issue.
Will have a look and come back if I find any other ideas. Can you also check your HP Software for this printer is fully updated! and windows updates if any updates.
Also post back which windows you have XP, Vista or Win 7.