From Home screen press Back/Cancel/Back/Back Buttons, in sequence.
- Pess OK to enter Support Menu (Selection Button 2).
- Press Selection Button 3 for Reset Menu and press OK (Selection Button 2).
- Press Selection Button 3 for Semi-Full Reset and press OK (Selection Button 2).
- Wait for unit to Power Down/Turn Off.
- Press Power button to turn the Printer On.
NOTE: RESET will restore all user defined settings.
Answer from: https://h30434.www3.hp.com/t5/LaserJet-Printing/problem-with-deskjet-3050a-j611/m-p/1837841/highlight/true#M69787