Have you tried holding the power button and the home button on the front for around 10secs?
Try this, the Apple logo should appear and get the phone to boot up.
If that doesnt work, boot up your computer and make sure you have the most recent version of itunes on it and then hold down the home button on the front of the phone while plugging into your computer and keep holding down the home button until you get a message on itunes saying an iphone has been detected in recovery mode. Then release the button and restore your iphone as a new iphone
**** Because your phone wont power on and it has been restarted this way you need to restore as a new iphone to get it to work again meaning you will loose any info on the phone ****
Make sure you update your phones software its most likely a factor to your phone shutting itself down.
Ive put the details below on how to restore your iphone, while restoring it will automatically update it for you - (after holding the home button and receiving the message on itunes follow the restore info)
Hope this helps :0) - Please Leave Me Feedback
- Select the Restore option.
- When prompted to back up your
settings before restoring, select the Back Up option (as seen in the
image below). If you have just backed up the device, it is not necessary
to create another.
the Restore option when iTunes prompts you (as long as you've backed up
your device, you should not have to worry about restoring your phone).
- Once the restore process has completed, the device restarts and displays the Apple logo while starting up:
For the iPhone only, after a restore, the iPhone displays the "Connect
to iTunes" screen. Keep your device connected until the "Connect to
iTunes" screen goes away or you see "iPhone is activated." If iTunes
does not have an Internet connection, you cannot complete this step.
final step is to restore your device from a previous backup. Once your
device is restored and-in the case of the iPhone-in the process of
activating, you should be able to see the following in iTunes:
Select set up as a new iPhone :0)