How to completely turn off iPad

Sometimes the copy protection on the iPad will get confused and think that it should quit an app after you try to launch it. This is usually fixed by completely turning the iPad off. Here's how to do it.

Press and hold the sleep/wake button until a red "slide to power off" appears. Slide to turn the iPad off.

After the iPad shuts down, press and hold the sleep/wake button until the Apple logo appears.

http://support.apple.com/kb/HT1430

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