One of my ystems is like this too, this is due to
the dead pixels on the screen, will the power adaptor
solve the problem? No. Can this be fixed? Maybe,
through Nintendo, but I think you'll be better off
getting another one from eBay, it'll be less hassle and
cost about the same. From my experience, the dead
pixel (lines) are from huge impact (I dropped this on
the floor once). I may not be right on tis, so get
more 2nd opinion.