My iPhone 4 doesn't turn on after updating to iOS 7.0.2

My iPhone won't turn on after I updated to iOS 7.0.2! I've tried holding down the power button and home button but it still doesn't do anything! It was jail broken but I removed it before I updated it. Is there another solution or should I just take it in to fix? 10 points best answer

That happened to my brothers phone too he have iphone 4 as well, we took the phone back to factory and the restored it you can't fix it your own, as it was jailbroken you can't take it to apple so you just take it to a phone repairing shop

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