My first purchase of ink cartridges for my HP printer was disappointing as neither the colour or black worked. I called and left a message and received a call back within 24 hours. He was very apologetic, explained that the ink cartridges were original HP, just refilled and gave me some tips on how to possibly make them work. He also sent me new cartridges right away and they worked perfectly in my printer. Must have been a bad batch. Very impressed with the customer support and commitment to their product and customers!