My iPhone 4 16GB will not turn on

I have had my iPhone 4 for approximately 1 year and a half. I've had no other issues with it until now, my initial thoughts is that the iPhone's battery may need replacing.
The issue:
My iPhone turned it's self off yesterday, on the initial reboot it came up with the 'iOS6 installation' and prompted me to connect the device to iTunes. However within 20 seconds of this displaying, the iPhone turned it's self off again. So I left it on charge overnight and once again this morning I tried to turn it back on however this time the device just shows the Apple logo on start up and then turns off and repeats the same process.
What I have tried so far is the home button and sleep/wake button method of restarting the phone. It does exactly the same, the apple logo appears then turns its self off.
So if you can offer any more advice on how to fix this please let me know.
- Ryan

Try recovery mode:
Leave the USB cable connected to your computer, but NOT your phone, iTunes running, press & hold the home button while connecting the USB cable to your dock connector, continue holding the home button until you see “Connect to iTunes” on the screen. You may now release the home button. iTunes should now display that it has detected your phone in recovery mode, if not quit and reopen iTunes. If you still dont see the recovery message repeat these steps again. iTunes will give you the option to restore from a backup or set up as new.

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Well I have a 16GB iphone 3G here in my hand that is stuck in a repeating reboot and will not boot up
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Message was edited by: Blakel

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Hi Happy New Year (not for me thgough)
Woke up this morning 1-1-2014 to find my iphone 5 dead and wont turn on.
Tried
recharging, connecting to PC, hard reset, DFU all modes but to no avail the phone is still DEAD
lSame thing happened two months ago, I went to apple service at my town and they replaced my battery, but now it happened again,!
Why are apples' iphone batteries so faulty, I paid around 80$ for the new battery, now i have to pay for one again after two months!!! this suck, and im sure this is not a software problem.
For Bridget71 try replacing the battery must be the problem...

My iPhone 4 16GB will not turn on

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