Iphone 4 screen isn't working?

So i was messing with my settings on my iphone and all of a sudden my screen just stopped working. I can't even unlock my phone because I need to slide it in order to unlock it. Is there any way I can fix this?

Hold down the home and lock button until the screen goes black, then let go on them both. The phone will bring up the 'apple logo' and load up as if it had just been turned on. Your screen should work

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