HP Photosmart 3310 does not recognize paper in tray
This is usually do to a sensor, your correct on that, thers usually a plastic piece that indicates theres paper and its broken or worn.
The other thing is that it may be the little rubber grabber is worn and not grabbing the paper, so the printer thinks thers no paper because nothings going through. These parts can be orderd but are usually costly depending on the printer. If its under warranty, take it back.
Also, check the trey and make sure it isnt a I.D.10.T error and you just set the paper to legal or something. I've made that mistake before.
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