HP printer will not print black if the printhead is dirty. So, you should clean it and then use the automated printhead cleaning option. Another resolution is to print with only the color cartridge. Printing in a single cartridge mode often helps resolve this issue. Go to the advanced printer settings and change it to black or greyscale. Visit:- https://www.hpprintersupportpro.com/blog/how-to-fix-hp-printer-wont-print-black-issue/