My iPhone 4 screen is black, how do i fix it?

The sound and vibration still works, i just can't see anything. My phone froze, so i locked it to try and refresh it. However, my lock button is broken and i use an on screen thing to do so. Its been black for the last 8 hours, help?!

Hold the home and lock button together at the same time for 10-15 seconds and you'll see the apple logo. That will work 100% unless there's something seriously wrong. Hope i helped!

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