How do I fix an HP printer that is not printing? Make sure your devices are properly connected with each other, and that the network or the cable you use to connect these devices is normal. You can also try restarting your HP printer. Turn it off completely and unplug the power cord, leave it for a couple of minutes, and then plug the cord back and power on the printer. Make sure the correct ink or toner cartridges are installed and the printer has sufficient ink or toner for your print job. Make sure no error messages or blinking lights display on the printer control panel. Resolve any errors before you use the printer. Restart the printer to clear any error states.