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Sounds like you cracked the LCD. I mean, did the screeen crack or anything by anychance? Besides if someting is rattling, I wouldn't think it's too important or else it wouldn't make ur DS work, obviously :P. Well if you're warranty is gone, then google "disassembling ds lite", find a video link, with a guy that has a german accent, and try to see what's rattling inside. As for the screen, if you say the screen has a rainbow type of look everywhere, and it feels hard under it, then it sounds like you cracked the LCD.
Robin I r sorrieez.