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Windows Central Question
I've got a nokia lumia 520 with widows 8.1 OS, and i recently have removed and placed back its screen (unscrew the back, put out the motherboard, put out the screen... place everything back) just from curiosity and now, when i am trying to open it, it appears the nokia logo, and then a blue screen with an unhappy face. Why is this happening? Because of me (removing the screen?). Or what? I'm not sure if i have to soft or hard reset it. Please some HELP!