Hello,
If you are referring to the printer display in your below description "Then abt 6-weeks ago the display option for Scanning and Display Ink Levels just disappeared,", then i guess you may have to do the follwoing....
1> While the printer is ON, unplug all the cords from back of the printer.
2> Wait for full 60 seconds.
3> plug in the power cord directly into a wall outlet ( bypass the surge / power strip ) and then into the printer.
4> If the printer is not powering on, press the ON button once to do so.
5> If the display issue still exists, then try tilting the display.
6> If issue still persists, then call HP Tech Support for further assistance.
If you are in US , the toll free # is 1-800-474-6836 .
If you are not in US , then log on to www.hp.com , at bottom-left corner there is a world map icon, click on it and then select the region you belong to, which would then provide support options for you for that region.