What exactly is the problem? We're guessing that the screen went black, but is the phone powered on with a dead screen or is it just dead? What happens if you phone it? If you reboot it does the screen come back on, even temporarily (e.g. flashes up a logo when it starts and then goes black again)?
Are there any other signs of something wrong? In particular any physical distortion (screen or back bulging)?
A black screen can mean anything from corrupt system software to a damaged display to a dead battery to a completely and permanently dead phone. That's why I'm asking these questions, because we need more information to work out what you might be looking at.
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