Stuck in continuous apple logo loop, turns off when cable removed?

"In most cases, you can solve these problems by putting the phone into recovery mode and restoring it from backup. To do that, follow these instructions:

1. Connect the iPhone's USB cable to your computer, but not your iPhone.

2. Turn your iPhone off. If the phone won't turn off in the traditional manner, just keep holding the buttons until the screen goes dark.

3. Once you've turned the device off, press the home button on the face of the device and plug in the USB cable to the device's dock connector.

4. When it turns on, keep pressing the home button until the iTunes logo appears on the screen.

5. You'll know the phone is now in recovery mode because a window in iTunes will tell you.

6. You can then start the restore process by clicking the ""Restore"" button in the iTunes window."

"In order to get the iPhone out of the Apple logo loop, you can try DFU mode as below:

Hold down the Home and Power buttons at the same time for 10 seconds. Then, release the Power button while holding the Home button for another 15 seconds."

"This article might help

Have you tried this with another usb cable? The cable might be damaged. It can also be the battery not charging. Try cleaning out the data port to make sure that it has a good connection with the usb cable.

The fact that it won't stay on is troubling. I think you have to fix this problem first before you try to restore it."

Bradley Kirwan, start by replacing the battery. If that does not yield any results, I'd consider a new dock connector. After that, you are looking at power management circuitry issues, on the logic board.

By the sounds of things sounds like you need a new battery, this should solve the issue. :-)

"Thanks to the suggestions here, I was able to fix my wife's ""broken"" iPhone 5. She recently dropped it while in a case. It didn't crack or suffer any obvious damage, but it refused to turn on without the charger connected. We tried to do the iTunes update and restore but neither worked. It would go to the Recovery screen but never beyond.

After reading about broken batteries, I opened it up and discovered... bad quality control from the manufacturer. It was missing 2 screws from the upper cable bracket, but more importantly, it was missing the entire bracket that secures the battery connector in place. This cable had popped out when it hit the floor so it wouldn't power up on its own. I reconnected it and reassembled it and it came up right away.

After doing an update through iTunes, everything was back to normal. Now, I am a hero! The battery idea made sense, but I expected to see it broken. Unplugged was easier to fix and cheaper."