I have been through most of a double black ink cartridge trying to get black to print. I have done all the diagnostic tools and at first, cleaning the print heads helped for a short while. Now it has completely stopped printing black. Having read previous entries, I see that the print head is defective and CANNOT be replaced. I have wasted expensive ink. The printer is less than 3 years old and has not seen heavy use. Furthermore, I don't see any HP printers for sale that use the same ink. All this adds up to a big expense for me. Obviously this printer is defective and needs to be recalled and replaced at no charge to us.