Iphone 4 stuck on Apple logo screen with loading bar?

I'm iPhone is showing that it is half way through downloading but has been stuck there for about 8 hours now. I tried to plug it into iTunes to restore in but then my computer asks me to allow access to my phone and when I do that it says I need to respond on my phone. I tried holding down the power button to turn it off but nothing works.

Are you trying to download IOS8? Because the iphone 4 is not compatible with iOS8…

No I'm downloading iOS 7.1.2

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