All of the sudden my Deskjet 6500 E709n all-in-one printer will not copy from the auto feed tray. The original does feed through and a blank piece of paper prints out. I know what you are thinking, that I am an idiot and have the paper in upside down, that is not the case here. I am using a double sided original. I can copy by putting the original on the glass. Any ideas on what I can try?