How do I reset the printer if it stops working?
Turn off the printer and unplug the power cord, then wait a minute before plugging the power cord back in and turning on the printer. On Mac, you can also reset the printing system by going to System Preferences > Printers & Scanners, holding the Control key while clicking the list on the left, and selecting Reset printing system. (Page 3)
From the official HP Deskjet Ink Advantage 3630 All-in-One Printer manual, page 3
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