I have the same problem with you ....http://h30434.www3.hp.com/t5/Printing-Issues-Troubleshooting/HP-DESKJET-produces-grinding-noise-and-now-it-wont-print/m-p/2859185/highlight/false#M54192
but now my printer wont print by itself so i have to manually feed the paper after hearing a beep sound. .. try cleaning this gear .. . and dont use your printer for printing until you have clean that area before its too late or gets broken like mine...put some oil or clean that spring, gear and everything below that gear.