What happens if you try to print just one sheet at a time?
(remove all other paper from the paper feed area)
Ok, then there is likely a small paper jam somewhere in the printer.
To clear this, try pushing a piece of stiff card manually through the printer - this will help to dislodge any tiny fragments of paper that aren't visible.
Let me know if that works?
You will need to use some card around the thickness of a birthday or greeting card.If it is not wide enough to clear the entire width of the printer, pass it through twice - once on the first side, then on the other side of the printer.
Can you try feeding it in the reverse direction - from the output tray into the printer?
Remember, you need to do this manually by hand and push it through.