Remanufactured Ink Cartridge Replacement for HP 74XL 75XL (1 Black 1 Color) 2 Pack one year guarantee Please ensure that the cartridge contacts and printer contacts are clean before installing the cartridge. Please make sure that the cartridge contacts are making a firm contact with the printer contacts. After installing the cartridge, if the printer is not working and you are receiving error messages like 'replace cartridge' etc, you may need to reset the printer. To reset a printer please 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.