There are way too many variables to provide you a simple "do this" answer. What you are experiencing is known as a "boot loop." It can be caused by a dirty/stuck power switch, rogue app installation, rooting gone wrong, and many other things. I suggest you sign-up lurk/read posts at XDA Developers and sign-up as a member here in order that ther can be a back & forth dialogue to help you with a solution.
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