If your HP printer is not responding, start by checking its connection to the computer or network. Make sure the printer is turned on and that all of the cords are firmly inserted. To fix any short-term issues, restart the computer and the printer. Next, update the printer drivers and software from the HP website or through the Device Manager. If the issue persists, run the HP Print and Scan Doctor tool to diagnose and fix common printing problems. Additionally, check for any error messages on the printer display and consult the user manual or HP support for further troubleshooting steps.