So the battery died completely in my girlfriends rooted Kindle Fire. When plugged into the USB cable via the computer, it would just keep shutting off and on again. I plugged it into the wall outlet, it boot up to CM9 and then shut right off again and indicated it was charging. Went to turn it on now and the device simply wont turn on. The back light turns on and off via the power button, but the device does NOT power on at all. Help?