To troubleshoot issues like HP Printer not printing black, you must follow and apply a few important steps and instructions. First of all, you must clean the printhead and then open the printer troubleshooter. Now, you should try to fix the printing with HP Print and scan doctor. Now, you can add a genuine Hewlett Packard cartridge to the printer. Now, you should replace cartridges that are low on ink, and then you should align the printhead. You can simply apply the steps; you can simply fix it.