How do I reset the HP Envy 5540 printer if it stops working?
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 the troubleshooting process. (Page 3)
From the official HP Envy 5540 All-in-One Printer manual, page 3
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