Samsung Galaxy S — factory reset unfinished

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Jul 20, 2015 4:00:42 PM via Website


I had problem with new 5.7.10 version of google play store in my galaxy s duos, so I uninstalled it and reinstalled the previous version. It didn't work, so I factory reset my phone. after restarting and asking for initial system settings like language and time, it doesn't go to the next step and the screen is black.
what is the problem and what should I do?