My iphone turned off by itself and it wont turn back on

Replace new battery for your Iphone 4S, if problem still manifest.Try to replace new LCD Screen. :0

Hold the power button and home button down together for 10 seconds, or until you see a white apple.

Turn it off and plug it in to charge (do not turn it back on, it will turn on by itself).

Try a hard reset on the iPhone. Basically all you need to do is hold down both the On/Off button at the top of the iPhone as well as the Home button (the physical round button at the bottom of the screen) for about 10-15 seconds or until you see the Apple logo on your screen. Once the Apple logo appears you can then release the buttons and let the iPhone turn itself back on again :)

Hi,
The next thing to do then before looking at a new phone... is to take the battery out and let it out for an hour or so... then replace the battery and try to turn it on...

heatman101

try holding down the home and sleep/wake buttons until you see the apple logo cycle.
sometimes it has to be held for longer than 30 seconds.

Iphone Connect With Itune
Turn Off Your Phone
Press Home Button for 5 Second
After 5 Second Press Power Button for few second
Release Power Button
Still Holding The Home Button
Itune Detect Your Iphone In D.f.u Mode
Release Home Button.

you can get the wire that connects your iphone to the computer or iphone to the wall. wait until its fully charged then try. take the battery out also and restart the phone

Hi slondon83,

I believe you will have to reflash your device, using the restore feature on iTunes and the CFU mode in you iPhone.

To restore your iPhone, you will have to enter to CFU mode:

1. turn off your phone, or wait it get turned off by itself.
2. press and hold the power button for exactly 3 seconds.
3. whithout leaving the power button, press the HOME button for another 10 seconds exactly.
4. after 10 seconds leave the power button but still, keep the HOME button pressed.

try all these steps, of course, while you iPhone is connected to your computer with the USB cable and the iTunes software is on.

you might be able to do it with this method too:


good luck!

Hold down the top button and the front button at the same time 'til phone powers off.  Then restart the phone. 
 Its a good idea to turn the phone off each night just to allow it to refresh itself.
Hope all this helps.
enov8