Stuck on boot screen

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http://androidforums.com – Hi guys I've been working with a friend's phone and I encountered a problem which I'm trying to solve since earlier today , now I found similar threads having not final results and after reading here and there everywhere I decided to open this thread so I can explain where is the difference in the problem Im having the main problem with the phone was the touch screen which was broken , I managed to replace that. when I try to turn on the phone it stays stuck on the "Htc EVO 4G" screen and doesnt show anything else, however, the phone sounds as booting , I tried calling to the (General)