Try to clean out the insides of the unit, includinig use of compressed air in a spray can.
Often the photo-sensors get blocked by paper dust, and they no longer give accurate readings, which then prevents using the printer.
Remove the paper stack and the ink cartridges first.
Carefully blow out everything inside the printer.
When done, try to use the printer again. It should work now.
Cheers.
-a.
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