Stuck in continuous apple logo loop, turns off when cable removed?
My iPhone 5 (model A1429) will not boot into iOS.
When the power cable is connected, the iPhone boots up initially and displays the apple logo for ~3.5 seconds. Then it goes to a blank screen for another ~2 seconds and the process repeats (indefinitely it seems - at least at this point).
When the power cable is removed, the screen instantly goes blank again. Nothing happens if I press the power button when the iPhone is not connected.
I can get the iPhone into recovery mode by holding the home button before I plug it in, and then it stays on the recovery screen, not coming on and off like the apple logo was earlier. Again, when I unplug the cable it goes back to a powerless blank screen.
The iPhone is detected on iTunes in recovery mode and I have attempted to restore it, using both my MacBook and a Windows PC. Each time, it results in an error at the point when the iPhone appears to restart. I see Error 2001 on the MacBook and Error 21 on the windows PC.
I've updated to the latest iTunes version, restarted the computer several times, and tried different USB ports.
I was also able to get the iPhone into DFU mode, where the screen was blank—but it was recognized in iTunes as being in recovery mode. Just as before, the device will not restore, and I get various error codes across my Mac and PC.
I have since opened the device up and confirmed that the battery is securely attached to the logic board.
It is also worth mentioning that my iPhone is no longer under warranty.
At this point. my assumption is that the battery itself is dead, and won't hold any charge, which is why the device shuts off immediately after removing the power cable. Does this seem reasonable and should I order a new battery? Any other suggestions?