Now it's turned off and it won't charge. When I plug it in, it turns on, displays the screen with the big battery, as usual, but only for a few short seconds. Then it turns itself on, even though it has no power, and shuts itself down immediately after it turns on, meaning it never charges. Then it goes t the big battery screen again, then turns itself on etc. and this goes in a circle for all eternity.
What do I do? I have no battery charger and I don't have any friends with a SGS3
(I'm running UltimaROM 17.1, in case that's related, which it might be, since I jut flashed it yesterday morning.)