markdaaboul, vertical lines on any LCD usually indicate a failure of the LCD panel. There is always a small possibility that this is caused by a faulty video cable itself,so check on that first. Of course, also check with an external monitor and see if it shows the same line, if it does you know that it is a GPU/video card error. If it does not, it is your LCD. Most likely you are having a defective TAB. On a LCD your size there are usually 10-12 "data" tabs located on the top of the LCD. These are what communicates vertical information from the board to the glass and there are also 3-4 "scan" tabs, which are located on the side that switch on which horizontal line to activate. If any of these Tab fails, you get one of those lines. It is very difficult to repair and would require some extremely expensive machinery. There are some places that do offer repair of an LCD, but the cost of that may actually be higher than a replacement LCD. Check with companies that offer Tab bonding like this. In a best case scenario, it might be possible to temporarily fixing it by applying pressure with cloth tape to the loose tab. Hope this helps, good luck.