Black Horizontal Line Along Bottom Of Lap Top Screen

[cherrieT]

I have a 2 inch horizontal black Line at the bottom of my screen, appears only upon startup of my SAMSUNG R720 laptop, then it disapears within 2 mins,I have pressed and shook the lap top but the line still remains, can someone plz tell me why it does this and how to fix it ? ?

[caperjack]

pressing and shaking might make matters worse ,so i suggest stopping that !
if it disappears within 2 minutes then its not an issue for using the laptop ,just annoying on start up,it may be just a resolution thing on start up or it could be a early sign of the lcd getting bad