I had an unusual problem with an HP LaserJet 3050 AIO that left me stumped. I received a 3050 back from a customer because it never worked. They mentioned that it would turn on, but they kept getting an unclearable message on the control panel. The error the customer was receiving was “No Paper Pickup”. Immediately I thought that there may be damage to the logic board or some sensor, but I had a hard time finding out where it was. After about 20 minutes of searching I happened across a spring that became “unsprung” and just needed to re-align it in place. Since there are many sensors and springs in the printer, I’ve included pictures of my fix. Please leave me a comment if you found it to be helpful.