When you don't use your ink carts for a while, when you get NEW ink carts that have been stored in warehouses for a number of months, or when you have refilled a slightly too dry ink cart, the print head nozzles on the bottom of the ink carts get clogged inside with dried ink. The printer head cleaner menu will NOT dissolve the dried ink inside of the nozzles. Water will. Try this. Soak the bottom of the clogged ink cart in 1/2 inch of hot water for 15 minutes. Blot dry with clean paper towel. Also wipe the electrical contacts on the back of the ink cart.  Retry.