Why won't my iphone turn on?

I was on an app on my phone I locked it then I tried to turn it back on and it wouldn't happen. So when I got back home I charged it and still nothing happened. If I turn the silent switch on and off it still vibrates. But when someone tries to call me it won't vibrate or anything. Please tell me what's wrong or what I should do.

Leave it for hour or so

Hold the home and power button. This will perform a hard reset. Should help ya.

Mine has been lazy before.

Try a restore before attempting reset.
Press home and top buttons and hold them for at least 10 seconds. See this. Best luck.

http://support.apple.com/.../kb/ht1414

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