Display problem, or data display cable problem?

Dear people,

Check out this video, it shows my problem.

http://www.youtube.com/watch?v=pEmAAXlj75o

My MacBook: Model A1278

Does anybody have any experience with this problem?

I think my display is still good because whenever i turn it into the right position the screen works perfectly. So is there a problem with the cable connecting? I replaced my memory for bigger 4x4 modules. Maybe some dust came in or anything else which is causing the error?

What to do, what to do. Any advice is welcome!