When the printer and computer are not accurately connected, you may receive an HP Printer Offline error message. In order the make the status changes from offline to online, you need to follow the below points: · Check your wired or wireless connection. · Make sure that your HP Printer is set as the default printer on your Windows system. If it is not so, set it immediately. · You can also try printing from another device. · Check the driver installed against your printer. If it is out-of-date, then also your printer says offline while printing.