Sometimes the rollers become dirty and cause the paper to slip. This can cause the paper not to pick up or even cause a paper jam because the sensors do not see the paper pass in a certain amount of time.To fix the problem, use a damp paper towel with water or Windex and clean the rollers. Start where the paper touches the printer and look for white, gray, and black rollers. Use your fingers to move the rollers as much as you can to clean them. Open the printer and clean the other rollers you can find as well.Open each cover front, top, and back of the printer and look for pieces of paper in the rollers. Move the rollers with your fingers or erase end of a pencil to clean and move any loose paper out as well.