Iphone 4 shuts off and can't turn on

My iphone 4 suddenly shut off and I can't turn back on, what should I do?
I tried pressing the lock button and home button together, and I still can't turn it on.

1wendyanne wrote:
My iphone 4 turned off on its own and won't turn back on
Try a Reset...
Reset ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430
If no joy... Connect to iTunes on the computer you usually Sync with and “ Restore “...
http://support.apple.com/kb/HT1414
If necessary Place the Device into Recovery mode...
http://support.apple.com/kb/HT1808
Note on Recovery Mode.
You may need to try this More than Once...
Be sure to Follow ALL the Steps...
But... if the Device has been Modified... this will Not necessarily work.
Once you have Recovered your Device...
Re-Sync your Content or Restore from the most recent Backup...
Restore from Backup
http://support.apple.com/kb/ht1766

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