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You can reset your iPad and see if that works or not. Press and hold the Power button and the Home button at the same time for at least ten seconds. iPad will automatically restarts and return to home screen. If it not restarts after holding the button for 10 seconds, hold down the Power button and the Home button until it restart itself.
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That brings up the keypad and when I lower the keypad it just leaves a gray screen with four icons at the bottom.