Error 0x887df78a on HP Officejet

  1. Take out both ink cartridges and leave them on tissue.
  2. Clean both cartridges thorougly with a dry cloth, and dab with tissue
  3. The four buttons in a circle with the button in the middle: press it and hold whilst the printer is ON for up to 30 seconds
  4. Pull out all trays
  5. Put the cartridges back in, put trays back in

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