Reset HP All-in-One Printers to Factory Defaults

1. Unplug the power cord from the HP All-in-One. 
2. Wait for 20 seconds. 
3. Press and hold # and 6 while plugging in the power cord to the HP All-in-One. 
4. Release the buttons after the HP All-in-One starts up. 
5. The HP All-in-One will now be reset to factory defaults.