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Hi, thanks for using JustAnswer.com I am Cris.
Try the following:
press and hold the Sleep/Wake and Home buttons at the same time. When the device turns off, release the Sleep/Wake and Home buttons.While pressing and holding the Home button, reconnect the USB cable to the device. The device should turn on.Continue holding the Home button until you see the "Connect to iTunes" screen. When this screen appears you can release the Home button.Open iTunes. You should see the following "recovery mode" alert:Alert text: "iTunes has detected an iPhone in recovery mode..."Use iTunes to restore the device, following the steps it leads you on
Let me know if you are successful.