Are there any lines on the screen that would indicate a broken substrate? If not, and a simple paperclip reset hasn't worked, and the device is fully charged (try a different USB cable if you are at all unsure), you need to try a factory reset.
Ensure the device is fully charged, for a few hours or overnight.
Ensure the device is turned off, by holding the power button for 10-15 seconds. Do this regardless of whether the screen changes.
While holding the Home button down, quickly slide and release the power button.
Wait a short while.
If nothing happens, repeat the procedure (in case you turned the device on rather than off in step one.
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If that doesn't work, try the procedure again, this time holding the Home button while doing a paperclip reset (instead of using the power button).
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