Hey There, I am Sofia Carter. The first step to resolve your hp printer won’t print black issues is to employ authentic cartridges from HP. You can also take off the black cartridge and print with the tri-colour cartridge. Another step you can take in this regard is to replace defective or empty cartridges, and give a thorough cleaning to the printhead. HP does not give you any guarantee about the quality of non-HP cartridges. Visit HP anti-counterfeit webpage to check whether your cartridge is genuine.