When you type a game id in why does the screen turn red and blue

oh it happend to me alot and i fixed it every time it happend, and now ill tell you guys how to fix it! first start up the ds but wait! before it shows Nintendo ds on the screen, press and hold start + select. then once the Nintendo ds screen fades away, and before it says this product is not licenced or edorised by Nintendo, press and hold A + B while your still holding start + select (so you will be holding start + select + A + B). after that the screen fades away and it takes more time to load as usual (the screen will be white for 10 secs) and then you can add codes again!