To fix an HP printer not printing on Windows and Mac systems, start by checking power and connections. Restart the printer, computer, and router. Ensure the printer is set as default and not paused. Update or reinstall printer drivers. Check ink levels, clear print queues, and run HP troubleshooting tools for quick resolution. https://medium.com/@carolinazoey69/why-is-my-hp-printer-on-but-not-printing-a568ea3f1a66