My nokia lumi 625 fell on the ground and its touch screen was cracked. I called my mum to notify her and then I was texting my friend. While texting my phone broke down. Now it shows my screen saver all the time and it vibes when I receive new text messages. It doesn't take any commands, nor the lock/unlock button, nor the start button, search or even back button. Any one can tell me what happened?? Thanks

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