Big problem, I was using my phone and it ended up crashing and stalling. Took phone battery out and put back in to restart the unit. Now on startup it shows me the galaxy s gt1m900 scrren, then turns off. If the power is plugged in, it will loop continiously. No clue how to get it back up and running, I did manage to get to the "downloading - do not turn off phone" screen but thats as different of a result i could get any ideas?