Fixed! ( for me).
As is stated normally this is the rollers. However I tried roller cleaning on my G4210 to no avail.
I noticed that I could not even force paper through the left hand side, which made me think something was blocking it.
So I folded a piece of paper long ways so it was sturdy but would fit through the right side. Then I carefully 'flossed" my way over to the left side and "Ping" out comes a push-pin that was blocking the paper! Funny thing is it was not visible at all from any view.