so my iphone 4s just suddenly stopped working...i didn't drop it or damage it in anyway. i got home from dinner and the screen was black. i waited a few minutes to see if maybe i had just accidentally put too many commands in but it was still a black screen. i tried plugging it in thinking it might have died..still nothing...it wont bring up any kind of screen no matter how long i leave it alone...is there anyone that can help me??