I turned my iphone off and now it won't turn back on?

I turned my iphone off the other night because it was a little slow but it won't turne back on.itried to reboot it, i tried to charge it, i even tried pluging it into my computer but my computer and itunes isn't connecting. I don't know what else to do. I need Help Please!

Is the little button on side switched to the lock position? If that isn't the problem, i say take it to your provider and have them look at it, or an Apple store

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