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Try resetting the device
But this will erase everything from your device.
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears.
iPad Still Doesn't Respond After Reset
Reset all settings: Choose General > Reset, then tap Reset All Settings.
Erase all content and settings: Choose General > Reset, then tap "Erase All Content and Settings."
Reset network settings: Choose General > Reset, then tap Reset Network Settings.
Now restart your device and check if it works or not.
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