Apple MB384LL User Guide - Page 114
Tips and Troubleshooting, General Suggestions
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Tips and Troubleshooting A A Most problems with iPhone can be solved quickly by following the advice in this chapter. General Suggestions If the screen shows a low-battery image iPhone is low on power and needs to charge for up to ten minutes before you can use it. For information about charging iPhone, see "Charging the Battery" on page 27. or If iPhone doesn't appear in iTunes or you can't sync iPhone  The iPhone battery might need to be recharged. For information about charging iPhone, see "Charging the Battery" on page 27.  Disconnect other USB devices from your computer and connect iPhone to a different USB 2.0 port on your computer (not on your keyboard).  Turn iPhone off and back on again. Press and hold the Sleep/Wake button on top of iPhone for a few seconds until a red slider appears, then drag the slider. Then press and hold the Sleep/Wake button until the Apple logo appears. Tap Unlock and enter your SIM's PIN if the SIM is locked. Note: If you enter the PIN incorrectly three times, you may need to contact your carrier for a Personal Unlocking Key (PUK) to enable your SIM card again.  Restart your computer and reconnect iPhone to your computer. 114