Guys..! hi i've iphone 4 , 32g. it was working perfectly fine, but few minutes ago when i took it out from the pocket its screen was black, pushed home button, light button, everything.. but its not working.. plugged in my pc and started itunes. its not detecting..tried to do hard reset as well.... tried doing it by pushing home and power button together for long times, but still its black.. no message, no logo... was perfectly fine...... does anyone know what could be the problem? secondly its jail broaken, would there be any problem to go apple store??