WE have a brand new Lexmark 7600 printer and I can't get the ADF to work at all for copying, faxing, or scanning. When I put the original document in the ADF face up, I don't hear a beep like the instruction manual says, but I do hear the wheel inside turning. When I open the top cover of the ADF roller and press the paper switch, the white rubber roller actually seems to be turning the wrong way! HELP!!