My iPhone 4 evidently turned itself off and will not turn back on.

I had used the phone recently, but when I went back to use it again, it was blank.  Like it's dead.  It is fully charged, and I had recently gotten the message to upgrade the Operating System.  Anyone have a clue what could be happening?

Have you tried resetting your phone?
Press and hold the Sleep/Wake button for a few seconds until the red "slide to power off" slider appears, and then slide the slider.
Press and hold the Sleep/Wake button until the  Apple logo appears.

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