HOX won't boot

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http://forum.xda-developers.com – Hello, i'm sorry that my first post on this forum is an question about my no longer working htc one x. I have been gathering information of this forum for a long time, and allways helped me, but this time i am really stuck. So in advance i thank you for all the help you already have given me :) This is what happened my first HOX had a defect sim reader, was declared DOA so i got a new one, so far so good :) but after using the phone for about 2 weeks, all apps started closing one at a time, untill the phone went black (it was still on, but nothing was working) at first i tought i in (HowTos)