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Windows Central Question
My N 640 XL mobile started misbehaving i.e. photos were missing and videos were not playing. This happened approximately one week back. Day before yesterday, i talked to Microsoft toll free number for resolving the issue. The customer care officer advised to press the volume knob and on/off knob together. I tried but no joy. But all on a sudden today morning my mobile has gone dead. Its not switching on only. Please render immediate help.