This is basically due to a faulty screen. Depending on which screen flashes white when you first turn the DS on, this tells you which screen is faulty. If the bottom screen flashes then it is the top screen that is faulty. If the top screen flashes then it is the bottom screen that is faulty. Screens are fairly easy to fit although the top screen is the harder out of the two, you can buy them off of ebay for around £10 and if you google DS screen replacement there are some good guides out there showing you how to do it.
Hope this helps
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