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.
Supplement. In zoology, segmentation refers to the division of a body part into segments. It may be homomeric segmentation in which the segments are more or less the same, or heteromeric segmentation wherein the segments differ from one another.Word origin: Latin segmentum + atio (process). Related term(s):1  Segment.oun, plural: segmentation. (1) (embryology) Cleavage, i.e. the repeated division of a fertilized ovum forming blastomeres. (2) (zoology) The division of animal or plant body into repetitive segments; metamerism or the state of developing segments or a series of repeating parts.