Lexmark P4350 Paper Feeder not working?

Everytime I try to print something the paper feeder does not grab the paper and feed it through. I can hear the rollers working fine. I get the message to say no paper in tray or that paper has jammed. I have tried loading larger and smaller quantities of paper and a single sheet. I have tried to hold the paper in position with a slight push when the rollers kick in. Sometimes this works but then the paper does not go through the feeder at the correct angle.