Well, I was just playing my DS Lite these days and when I opened more the top screen it suddenly turned withe and with a lite dots in some places. I tried to take it back to the position it was before but it kept white. The other day I tried again. It was still withe, so I decided to play a game that only needs the touch screen, Mario vs. Donkey Kong: Mini Land Mayhem. I was playing it, when suddenly the top screen showed up again. I moved it and it didn't became white at all. On the other day I tied it again, and it was all white again, no matter how I moved to top screen. So, any clues to the reason that happened?