Remanufactured CC653AN Ink Cartridge for HP 901-Black one year guarantee If cleaning the cartridges do not work, kindly reset the printer. 1.	Remove the cartridges out of the printer and shut printer off. 2.	Unplug printer from the power outlet and your computer as well. 3.	Turn off your computer as well (if you are able to). 4.	Wait a few minutes before turning on your printer. 5.	Turn your computer on (if turned off). 6.	Plug in the printer to the outlet and to your computer as well. 7.	Turn your printer on and wait until it starts up. 8.	Install the printer cartridges, and if alignment page does not print out automatically, try doing it manually. The reset of the printer should allow the printer to read the new cartridge. If the cartridges are not recognised kindly make sure that the contact points are clean before inserting the cartridges.