Why does my iphone 4 stay on ios6 screen?

I dropped my phone a while ago and now it turns off occasionally, but when i plug it in and turn it back on it goes onto IOS6 start up screen and tells me to connect to Itunes, but when i unplug my phone it turns off again and won't work in the computer, can someone please tell me how to fix this!

Plug it while holding the power button + middle button
If it doesn't work you need to take it to a repairs store or something it ain't that easy

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