Perhaps try this (from http://support.apple.com/kb/TS2802). Probably want to start at step 6 if you feel that you've done the previous steps exactly as described.
- Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
- Check if the Liquid Contact Indicator (LCI) in the headset jack or dock connector is activated or there are signs of corrosion or debris. Learn more about LCIs.
- Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
- After at least 15 minutes, if:
- The home screen appears: The iPhone should be working. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen . Then unplug the phone from power. If it immediately turns off, seek service.
- The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
- If something other than the Home screen or Low Battery screen appears on the display, continue with this article for further troubleshooting steps.
- If the iPhone did not turn on, try resetting it while connected to the iPhone USB power adapter. To reset, press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until either the Apple logo or the battery symbol appears.
- If the display turns on, go to step 4.
- If the display remains black, go to next step.
- Restore the iPhone. Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article (http://support.apple.com/kb/HT1808) for further assistance.
- If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
Same has happened to me. Thought I was doing the right thing updating my iphone 4 to ios 6, followed the procedure to the letter, even bothered to back up before updating. Now the phone is stuck in a start up, connect to itunes loop. I not connected to computer the phone shuts down. Is that it now, is my phone dead? Itunes doesn't recognise a device, nor does the computer, however it does make the ping sound when a usb device is connected & intermittently pings while connected. Does this mean its recovering or not? Will leave it on over night & hope the best. Just renewed my contract to & passed on a new phone!! Grrrrrr. Come on apple, help us out.
IOS 6 killed my phone too, went into my apple store and up to the genisus bar and the man on the stool next to me had the exact same problem, The tech tried to do the restore for both of us. Aparently my phone is stuck in a loop. Ok so we both upgrade perfectly good phones (mine was 28 days out of warranty) and it kills our phones....
and we have to pay $179 for another phone. yer, not happy!!
I wont be singing the apple song to anyone anymore have told all of my frineds to stay away from the killer IOS6
Apple killed my iPhone 4 too. First they prompt me to download the upgrade to iOS 6 then they wrecked my phone--MY property. No warning. No caution.
I've followed all the various posts in their advice and my phone is still dead. I am angry.
This comes two weeks after iCloud failed for almost three days. iClown.
And I hear Maps is a joke. Basically Apple fobbed a lousy maps app on everyone because they're fighting with Google. It's nice to know that the customer comes last.
I used to love Apple. I bought Apple for my family and for my employees. But I am close to walking away from Apple. I worried when Jobs passed away that things would slip. I'm surprised how fast they have gone downhill.
My trust in Apple is 98% gone.
It happend to my ios iphone 4s as well. After upgrading to IOS 6, everything seems to be fine. Until I had only about 40% of battery that I decided to charge my phone since I was travelling the next day. I noticed after plugging the charger, I get the error "charging is not supported with this cable". I check the phone but it can do everything, make calls, send sms, everything is working fine. It just won't charge. So I decided to backup everything and put the phone in restore mode. But the phone once plugged to my macbook pro can't be detected. So I decided to save battery and turn off the phone instead. But once I powered it off, it will simply boot up back. I had no other choice to save the battery since it won't turn off.
Now the battery is dead. It won't charge (tried different chargers / tried using another laptop and usb cable / bought a car charger) none worked.
So followed the steps by CC45.
Step 1. Sleep/Wake button is functioning fine
Step 2. LCI is not activated
Step 3. Plug the iphone to it's USB charger. Almost 2 hours now. Nothing happened.
Step 4. I think I have to skip this because the phone is just dead. no signs of charging whatsoever
Step 5. While currently charging (I tried the reset) nothing happens
Step 6. When plugged to USB port. It's not detected. nothing happens. Tried it with a windows laptop. same thing.
I'm planning of having it charge overnight. Hopefuly like some post here, it will miraculously come back to life.
Check out this thread: https://discussions.apple.com/message/20169568#20169568
I had a completely dead iPhone 4 and was eventually able to get it back 100%. Takes patience and 50 attempts to get the phone to restore and boot then resetting all data and contents <Settings> <Reset> <Erase All Content and Settings>.
Persistence. I must have tried the restore in iTunes 50 times over a one week period with mixed results each time. Even after the last restore and reset which brought it back to life, it ran a little qwerky for a couple days before the crash log settled down. A few apps were hanging which was resolved by deleting them from the device and iTunes, then downloading new from the App Store. If you can afford the time, there's nothing to lose with restoring and resetting all settings and contents until it starts to act right.