it could be something to do with your USB drivers. You should try to go to the hp site and download the lastest drivers for the printer and see what happens.
Or you could try to look on the techforum of HP, they also provide a couple of solutions:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?loc...d=18972&objectID=bpl11642