Strange white/grey line across macbook air screen

I have a 11'' 2012 macbook air with a strange horizontal grey line that won't go away first 4 seconds when i turn on the device that line is white then turns grey and stays that way.

Is not a software issue, external display does not show that glitch, can't send it back to apple it's like a year and a half old. Do i need to change the display or could it be something else that could be fixed without buying another screen?


pictures

http://s27.postimg.org/f07pdr2ab/WP_20140612_009_1.jpg
http://s27.postimg.org/51mqr9sur/WP_20140612_010_1.jpg
http://s27.postimg.org/mu8az5a37/WP_20140612_011_1.jpg

If an external display does not have the horizontal line thru it, then it's likely a screen defect. Changing out the screen is probably what you're going to have to do. You should always buy Apple Care for a portable computer - but too late now. I don't know where you're posting from (Mexico?) but you'll need to check locally for an Apple dealer.