Printer was working fine for more than a year. Suddenly I get message "Printer HP6D618A(HPOfficeJet Pro 870) does not exist on this computer. Double check the printer's name & make sure that the printer is connected to the network." The printer shows as being connected to the correct network and is enabled. It asks for WPS PIN which is supposed to be on the computer, but it is not. How can I get the printer to print again?
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