If the standard troubleshooting did not resolve black not printing I would suggest removing the black cartridge. Turn it over and examine the area around the ink port. There are four orange plastic spots, left over from the protective cap. Make sure these are flush with the cartridge body, if not carefully trim them flush. If the plastic nubs protrude they can prevent the cartridge from seating properly. Before replacing the cartridge in the printer dribble a few (maybe four) drops of hot water into the ink port in the printer and two drops into the ink port on the cartridge then snap the cartridge back in position.