Iphone 4 shut off won't turn on?

It has did this before, and i held the lock and home button down and it worked. But this time it isn't working.i've tried everything but the computer won't even recognize my phone. Help.

Added (1). I tried that. It didn't work this time.

Hold the center button, and the top button at the same time, should restart it.

You should restore the whole iPhone

Close the iPhone completely then keep holding the home button while you plug/connect it to iTunes and this will put it to DFU mode. Then you can restore or update.It'll help

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