I have an Epson Stylus 1520 that uses the same cartridges as the 800. The printheads are built into the printer. Only brand new cartridges have been used in this printer. Each color, black last, has in turn, sputtered and died. It acts as though contaminants have clogged the printheads, but I can't believe that all four sets of print nozzles have clogged at about the same time. Do I have clogged printheads that need to be replaced, or is there another mechanism that has failed? How to fix?