My Iphone screen went black. Now it won't turn my back on

My Iphone screen went black. Now it won't turn my back on.

Try hard resetting it by holding the home and lock button for 15-20 seconds

DUDE I JUST FIXED IT.HERES WHAT TO DO.
HOLD THE HOME BUTTON AND THE SLEEP BUTTON AT THE SAME TIME FOR 10 SECONDS THE APPLE LOGO WILL APPEAR IN THE BLACK BACKGROUND THEN BAM! IT WORKS! 8)

Make sure it is charged

  • Screen of my IPhone went black and now it won't turn on, what is wrong? The screen on my IPhone 4 went black and now it won't turn back on. It didn't get wet or anything Please Help! It was fully charged when this happened AND when I plug in it will not even light up.
  • My iphone went black and won't turn back on! 1? I was walking home and i locked my screen put my phone in my pocket, kept walkin then i tried to check my phone and the screen was completelty black and wouldnt turn back on. I tried holding the home & lock button at the same time that didn't work, i tried plugging it into my computer and to my wall charger. And it still didn't turn back on, someone tell me what to do!
  • My iPhone went black and won't turn on? Lately my iPhone has been turning off at random times and the screen won't turn on and will stay black until my phone dies and I charge it again. What do I do?
  • My iphone screen went black and now it won't turn back on ALSO! It still vibrates when someone texts me and siri also turns on when i hold down the home button but i plugged it into my mac and tried to hold down the lock and home for 10 seconds to reset it but then it says i need to back up my phone, which i can't because my phone is locked and i don't know how to unlock it on the computer.