If the iTunes neither recognizes the device you connect to your Mac, nor show the icon for your device, it may be caused by the following reasons.
Before we get down to the specific reasons, you need to know where to locate your devices. And one thing you need to keep in mind is that where to find you device depends on the version of your iTunes.
For iTunes 12:
Locate your device by tapping on the device's icon in the top left corner of the iTunes window.
For iTunes 11:
Find your device by hitting on the button showing your device's name in the top right corner of the iTunes window. If you're in the iTunes Store, hit the Library button in the top right corner first. If you don't see your device, select View > Hide Sidebar.
Reason 1: The device isnâ€™t turned on.
Make sure you have turned on your device before you plug it into your computer and you can get to the home screen. If you forgot your password tragically, the only way is to erase all the content presently on your iPhone, iPad or iPod Touch by using â€œRecovery Modeâ€.
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