Support Stuck on Samsung logo screen

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http://androidforums.com – I purchased a GS3 on Ebay and received a phone from China. When I initialize the phone the Android logo pops up followed by the Samsung logo. I think I might have a clone or fake. The phone sits on the Samsung logo for a minute and then turns off. I am unable to turn the phone back on unless I remove the battery and then it will become stuck again. :mad: I have tried to do the hard factory reset Volume up+Home and then Power button (still holding volume and home) but it simply starts the phone like normal until it gets stuck. If I hold the Volume up+Power button I am directed to a Spreadtrum F (General)