The DSi is a hand-held game system created by Nintendo. The system has a fold-open design with two screens. The top screen is for viewing the game you are playing, while the bottom screen is touch operated and accepts input from the included stylus. As with any electronic device, the DSi may become frozen. The screen may freeze up and become inoperable or the buttons may stop responding. There are a couple of things you can do to try to fix this issue yourself.
Instructions
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1
During game play, if your screen freezes, tap the "Power" button or return to the home screen of the DSi.
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2
If this does not work, hold down the "Power" button to power off the DSi. Hold the "Power" button down again to turn the device back on.
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3
If your screen is still unresponsive, you will need to have the DSi checked and potentially repaired by a professional.