Non Jailbroke iPhone stuck on apple logo?

My Non jailbroken iPhone 4 is stuck on the apple logo. It died so I plugged it in and it won't turn all the way on. I tried turning it off but that doesn't work. I plugged it in to my computer and a message popped up on itunes saying "Please respond on your iPhone to allow access" but I can't respond on my phone because it is stuck on the apple logo.

Probobly gotta factory reset it or restore from a backup. Sorry bro:/

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