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, some of the print head nozzles on the bottom of the ink carts get clogged with dried ink. The printer head cleaner menu will NOT dissolve the dried ink. Water will. Try this. Soak the bottom of the clogged ink cart in 1/2 inch of warm water for 10 minutes. Blot dry with clean paper towel (you should see the ink color on the towel). Retry.