4 Pack Remanufactured Black Ink Cartridge Replacement for HP 901XL (CC654AN) one year guarantee Troubleshooting steps : 1. Reason 1: The cartridge contacts are not making a firm connecting with the printer contacts. This happens if you have not installed the cartridges properly or if the cartridge contacts or printer contacts are dirty. Tell the customer to make sure that both of the contact points are clean and that the cartridge is installed firmly. Reason 2: The printer may need to be reset. To reset a printer they can follow these instructions. 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. Reason 3: The cartridge was damaged during shipping. The ink cartridge circuit is very delicate and does get damaged during shipping at times. If cleaning the printer and cartridge plus a printer reset does not fix the problem then the cartridge was damaged during shipping. -