My iphone 4 won't boot up past the apple logo?

I've had my iphone since september, it's refurbished, but like new. I turned it off because it froze, but now it won't turn back on?

It's probably completely corrupted. Connect it to a computer and put your iPhone into DFU mode, then restore to make it work again (at the loss of your apps, unfortunately. You'll have to download them again.)

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