Hi. I need some help for my MBA Mid2011 11.6inch (Core i5 2467M 1.6GHz). I bought it 1 week ago in a 2nd hand shop here in Japan. For 1 week I was using it for light everyday tasks like emails and internet only. Just yesterday I found out a vertical hue/shade about 2 inches in the middle of its screen. It is only visible in dark colors. It didn't show up on screenshots so I think it is more of a hardware issue. I attached pictures for reference. Haven't done AHT yet.