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Thanks for using JustAnswer.Add this page to your Favorites/Bookmarks first, so as to get back to me anytime later on, if needed.Try this first:-Unplug the iPhone from the USB cable connection (if connected).-Press and hold the Home AND the Wake/Sleep buttons until the Apple Logo appears (about 15 seconds).
The On/Off, Sleep/Wake button: This button is on the top of your iPhone, and you use it to put your iPhone's screen to sleep or wake it up.
Home button: It's on the front of the iPhone (large round button near the bottom).
It should reboot and resume normal operation.Reply back if that does not fix it.