Hola a todos,
I guess I will post my experience, since I just went through the same bad experience with my iPad 2.
tl;dr
It's working now. It seems to be fixed all by its own. Details below.
Last night I pushed the battery to the max watching Netflix, and eventually the iPad turned off, like it was expected. I plugged it in to the wall and left it there for the night, like many times I've done before.
But this morning all I got was the loop of ****: the battery icon with the red bars, then the apple logo, then black, then the battery icon again, and so on.
After many readings I realized the device was trying to load iOS but it didnt have enough battery power (why this didnt happen before, when the iPad had the same little amount of battery charge and yet it just charged fine? it beats me).
So I followed this clever hack: trying to stop the boot loop over and over, in order to get some battery charge, enough for the iPad to load http://www.daniellehatfield.com/2014/05/how-to-save-your-ipad-from-the-loop-of-d oom-a-true-story-of-patience-and-curse-words-by-danielle-hatfield/
This is: wait for the battery logo, then the apple logo, and then quickly press Sleep and Home button for a few seconds until the apple logo dissapears, followed by a 'quick white flash' seen around the screen. I thought that 'flash' was the signal that the boot was stopped. So all good until here.
I tried this, not as many times, just 6 o 7 maybe, like a test. Stopped, leave the iPad there, planning to comeback and try again later.
BUT when I came back I noticed the loop went from "battery logo-apple logo-black screen" to "battery logo - quick white flash - black screen". Yep, the same flash thing that I got when I pressed Sleep and Home button, it now appears all by its own, over and over. Why? I dunno.
So at this point I couldnt find what else to do. None of the posts I read described this scenario or sequences that didnt include the apple logo.
I tried connecting the iPad to my Windows laptop, to at least get the Recovery Mode (and knowing the laptop wont charge the iPad through the USB port. it never did, it will just work for iTunes sync). but nothing happened.
So I left it there and returned to work on stuff on my laptop.
After maybe 15-20mins I see the apple logo showing up on the iPad, out of nowhere. ***!
It will then load iOS, shows 1% battery and the message that it is connected to the laptop but it is not charging.
Ok then. I plugged it to the wall, and it's charging now.
So, what went wrong? And how was it fixed?
I cannot tell. All I can say is this: be very patient, and try all sort of solutions given in this thread. Try all of these before thinking on wipe the whole iPad, send it to repair shop, or even get a new one. Sometimes the solution is not as radically as it appears to be 🙂