HP Laserjet Pro m521dn Offline
Power cycle and verify whether the HP Laserjet Pro m521dn troubleshooting issue persists. Choose Devices and Printers list from the control panel of your computer. Right click on the printer which is in the list. Select the Default printer icon. Click See What’s Printing and choose Printer. Make sure to choose the correct port. Click See What’s Printing and choose Printer. Make sure to choose the correct port. You need to uncheck the Use Printer Offline option. Try to link your printer and check if the issue has resolved. If not, ensure that the router lights are blinking properly. Ascertain that the router provides an uninterrupted internet supply to your computer. If an unstable internet connection persists, contact your ISP (internet service provider).