My iphone randomly turned itself off

My iphone 4 randomly turned itself off and will not turn back on!!! the battery charge was high! so no reason to die! also my iphone will not charge using iphone4 charger or usb on computer!!! have tried holding home button 4 ages and power button and also both at the same time and nothing will work!!! PLEASE HELP..!!!

Try holding down both the power and home button for about 15 seconds. If that doesn't work try plugging it in and doing that it happened to me once and that fixed it.

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I have had my iPhone for about a year and a half now. In about the end of November I updated the software to the iOS 5.0.1 or the newest one then about two weeks later it started randomly turning itself off. It hasn't gotten to the point where I have to do a hard reset(hold both the home/sleep button) to get it to turn back on. I can turn it back on by just holding down the power button for a few seconds. Does anyone know what causes this and or what would fix this problem?

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That's a very strange issue, but at the moment it could be software or hardware - the only way to find out is by restoring the iPhone.
http://support.apple.com/kb/HT4137 has all the information you need to backup and restore the iPhone.
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If it's hardware, the same thing will still happen even after restoring, and you'll want to get the iPhone serviced.

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Thanks for your help. I tried plugging it in but nothing happened, I actually still had battery power left. I was able to solve my problem by holding down the power and home buttons, which reset the phone and got it started again.
Thanks for trying

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iPhone won't operate under 0°C.
At page http://www.apple.com/iphone/specs.html you can see environmental requirements:
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Try a reset by pressing the home and sleep buttons until you see the Apple logo, ignoring the slider. Takes about 5-15 secs of button holding and you won't lose any data or settings.

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Me, I would call apple Help..it's a new iPhone..

My iphone has turned itself off and wont turn back on again, what do i do?

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tried that did nothing, but saw that if i hold both buttons it turned itself back on. thnak god! wonder why it did it though.

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Toggle the Mute switch a couple of times. The hold the HOME and SLEEP buttons at the same time until an Apple logo appears, or 30 seconds have gone by. If you see nothing you have a hardware defect in the phone. If you seen anything at all on the display follow its instructions, which will probably be to connect to iTunes and restore the phone.

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Hi,
My iphone was working on Friday night and when I woke up it had turned itself off!
I left it a few days and it worked again for about 30 mins and has turned back off again! Ive checked the water sensors which are fine, held both buttons down together for over a minute, nothing, plugged it into the charger, nothing, and onto itunes which shows a message to say "your iphone is in recover mode". Can anyone suggest anything else I can do as its been 3 days now!!!
Thanks

You can try to press the home button and power button and hold them for around 15-20 seconds. This will perform a soft reset similar to pulling the battery. If that doesn't help you may need to restore it.

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You might have a bad battery. But first try recalibrating the battery gauge. Run the battery all the way down until the phone shuts off and doesn't restart. Then charge for 4 hours with the wall charger. Repeat the process. If the problem remains you need a new battery.

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Do you have a case on it that might be pressing your power on button or might press your power on button inadvertently when you touch it.

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Connect iPhone to Wall Charger and Reset, hold both home and power buttons until it begins to start. This can take about 20 seconds of holding both buttons. Try several times, if still nothing, the make Genius reservation and take to Apple for resolution under Warranty.

My iphone randomly turned itself off

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