IPhone won't turn on after software update

Last night I went to update my iPhone 4S to the latest iOS 7. I went to sleep while it was updating and it was charging and when I woke up it wasn't on and it kept vibrating every few seconds when it was charging. I tried to turn it on, then I tried to restart it and held the home and sleep buttons for 20 seconds. I tried connecting it to iTunes and iTunes won't detect a device. Any help??

I tried to restart it and held the home and sleep buttons for 20 seconds.
Try it this way ...
Press and hold the Sleep/Wake button for a few seconds until the red "slide to power off" slider appears, then swipe the slider to power off.
Then press and hold the Sleep/Wake button until the Apple logo appears.

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