Let's get you unfrozen. Press and hold the power button and the volume down key and keep holding until the logo starts to appear. The phone maybe dead as well. I would try this on and off of the charger. You may have to hold it for a couple of minutes in order for it to unfreeze.
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I think you mean power key and volume up key. Using volume down with power does a screen capture and if you continue to hold the buttons, you get thrown into something you may not want to mess with.