Iphone screen went black what to do

Ok I have a iphone 3g I was texting someone back and as I was texting them the screen went black! I plugged it in to the computer it wasn't showing up on there either it had over half a battery left I held down the home an power button muliplte time friends tried calling ect what do I do help please!

Hold home and power for 20 seconds.

Oh no what ever did people do before they had iphones! Your life is in jeopardy better fix your phone as soon as possible!

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