How do I reset the HP Envy 4500 printer if it is not working correctly?
To reset the printer, turn it off and unplug the power cord. Wait a minute, then plug the power cord back in and turn on the printer. You should also restart your computer as part of this troubleshooting process. (Page 3)
From the official HP Envy 4500 E All-in-One Printer manual, page 3
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