ann, i guess you need at least a new touch screen. The guide is available [guide|1304|right here] and the touch screen is available at places [http://www.ecrater.com/p/6312936/lcd-touch-screen-replacement-for-nintendo|like this] and if you need a new LCD you can get it [http://www.google.com/products/catalog?q=nintendo+ds+bottom+screen+replacement&hl=en&prmd=ivns&bav=on.2,or.r_gc.r_pw.&biw=1024&bih=629&um=1&ie=UTF-8&tbm=shop&cid=16239087364926147063&sa=X&ei=tJ5lTqbIIcWHsgKNzrizCg&ved=0CIQBEPMCMAg|from here]. Overall not a lot of money and not a bad job. Good Luck