Iphone 4S wont come on after an upgrade

I installed the recommended apple upgrade (i think it was ioS 6 or something like that) on my Iphone 4S earlier today, and although it worked for a few hours after, i discovered about an hour ago that it has shut done (black screen) and will not come back on. I havle held down the tp right hand on/off button for 10, 20, 30 seconds and nothing! Even Itunes wont recognise it! What to do???

Well, having left on charge for about 5 hours, all of a sudden it came back on, and has been working fine all day today.

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My wifes has started to do the same, the iphone 3Gs was mine, I updated it to ios 5.0.1 while still using it and it was fine. I did a backup restore of her old 3G phone and again it was find for awhile.
We noticed she doesnt have any data part of her package so we have switched off the data, since then we have this issue.
I had to install a new docking part of the phone as her mic was faulty, I did the sim out, switch on 3G and data and then sim back in. Switched the phone off and then back on. all good.
I stripped the phone down adn replaced the part. again all good. That I night my wife said Shall she turn the phone off in which I replied it should be fine. When she turned the phone on in the morning, the reboot problem was back.
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Let me write intelligibly instead...
iPhone 4 screen won't go to sleep automatically after upgrading to IOS5. Phone isn't plugged in to power or Mac. Screen simply remains illuminated wasting battery until I manually press the on/off button at top of screen. Anything suggestions please?

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The terms of service of the Apple Support Communities prevent us from helping anyone with a jailbroken phone.
You're on your own. Good luck.

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Hello Kimbo1991,
It sounds like your phone is not successfully booting even though you have reset the device. I would next recommend attempting a backup and restore to iTunes with this article:
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http://support.apple.com/kb/ht1766
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http://support.apple.com/kb/ht1808
Thank you for using Apple Support Communities.
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Iphone 4S wont come on after an upgrade

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