My iPhone 4 screen turns black and unlocking the screen does not work

Helpppppppp! I tried to open a webpage but then I locked the screen, I tried unlocking the screen but nothing happens. The screen is still black. Muting and unmuting works, the iPhone shakes but the screen doesn't come on. I have tried holding the home button and the lock button but nothing happens...

Try a reset: Hold the Sleep/Wake and Home buttons and don’t let go until the screen goes dark and the Apple logo appears (no data will be lost)

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