將 iPad 關機，然後重新開機。按住 iPad 頂端的“睡眠/喚醒”按鈕持續數秒，直到顯示紅色滑桿為止，然後滑動滑桿。接著按住“睡眠/喚醒”按鈕，直到 Apple 標誌出現。
重置 iPad。同時按住“睡眠/喚醒”按鈕與“主畫面”按鈕持續 10 秒以上，直到顯示 Apple 標誌為止。
or this
How to Do a Hard Reset on Your iPad - from eHow
1
Press and hold the "Sleep" button on the top right-hand corner as well as the "Home" button simultaneously. The "Apple" logo appears after 10 seconds, and your iPad is completely erased.
2
Connect the iPad to your computer via the Apple USB cable. ITunes appears on the screen and asks if you want to restore your iPad from a backup.
3
Choose "Yes" to restore your iPad from a backup.
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