I bought a brand new DSi like a week ago and after three days I noticed a small area of the touch screen that would get discolored when I touched it. Kind of like the you poke an LCD screen, the colors get all wavy. That's exactly what would happen when I touched that area. I advise everyone to go in to the Calibrate Touch Screen process and touch EVERYWHERE on your touch screen and look for discoloration so you can possibly get a replacement or send it out to Nintendo. Also, look as closely as possible at your Styli as you can, because mine had burrs on them that would scratch my touch screen.