My iPhone 4 stopped working?

Since I tried downloading ios7 on my iPhone last night my iPhone no longer turns on, it was on this morning then the problem began out of no where. The only thing that shows is the apple icon and yes it is fully charged and has been on the charger for hours now because I don't know what else do to. Does anyone know what this is and how to fix it?

Take it off the charger and wait a bit try to turn it on if not take it to your carrier and have them run a digonostics test on it

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