You might need to do a hard reset on the printer. Try to unplug the power cable at the back of the printer, while it's off press both # and number 3. While holding and pressing, connect back the power cable at the back and wait for the printer to turn on.
If it will not work for that reset, try to do the hard reset. You can do the same procedure but this time press and hold # and number 6.
If still not working, try the steps found in this article
HP Reset. There are other hidden commands on the printer depending on its model.
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