Why isn't my iphone automatically starting itunes when i connect it or showing up in itunes when i open it

my iphone isn't syncing with itunes. when i plug it into usb on computer it asks if i trust this computer. i press ok and it makes the noise as if i disconnected it and itunes never opens. when i open itunes manually, my phone doesn't even show in itunes to manually sync.

http://support.apple.com/kb/ts1538

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