I have tried screens and no difference. Any help would be appreciated
JOKE ANSWER: Someone painted the screens black? No clue, however, you may want to either do what hiyadudez suggested or maybe ask the author of this Instructable: https://www.instructables.com/id/Repairing-a-Nintendo-DS-Lite/
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Well, you could probably try taking out the battery, re-inserting it then try again. Or maybe you could take it to a game shop such as Game Station or GAME and ask them, they should know the answer. If none of it works then you have a permanently broken DS Lite.