1 If the black lines aren't visible on the external screen, the laptop screen may need to be replaced. 2  If the black lines are also visible on the external screen, the video card or motherboard may need to be replaced. 3  In some cases, a loose video card can cause problems with the monitor video.
1. segmentation - (embryology) the repeated division of a fertilised ovum. cleavage. embryology-the branch of biology that studies the formation and early development of living organisms. cell division, cellular division-the process in reproduction and growth by which a cell divides to form daughter cells.
Segmentation is a muscular movement that occurs in the small intestine. The alternating forward and backward movements of segmentation further mix the partially digested food and digestive juices and bring this mixture (called chyme) into contact with the intestinal wall.egmentation is a muscular movement that occurs in the small intestine. The alternating forward and backward movements of segmentation further mix the partially digested food and digestive juices and bring this mixture (called chyme) into contact with the intestinal wall.