Hello, I am Nikita Kumari. I am digital marketing specialist and freelancer. When your HP printer not printing black prints, several factors may contribute to the issue. Start by examining the ink or toner cartridges; they might be empty, clogged, or expired. Ensure proper installation and remove protective tapes. Run the printer's built-in cleaning utility to clear any dried ink or toner. Adjust print settings to grayscale to force black ink usage. If the problem persists, check for driver updates on the official HP website.