79 errors are usually firmware related on newer HP models. Disconnect any USB or Network cables and power cycle the printer. If it will come to read, connect a USB cable from the printer to a computer with internet connection. Then you want to go to
www.hp.com and search for the current firmware for your model which will be a program you download and run and it will automatically update your printer. Also ensure that if you are connected to a network that you clear all print jobs from any computers that might print to this printer.
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