I have an Epson Workforce WF-7310 with very low hours (it is not used often). Not surprisingly, the print head clogged and would no longer print black (it still printed color). I cleaned and flushed the print head using the syringe-method. Now it will not print black or color. I am guessing that the print head needs to be primed but am not quite sure how to do that. If priming is required, the only way I can see to do that is with refillable cartridges, but I really hate to have to buy even more cartridges. Any suggestions?