I was in the middle of using an app on my iphone (that I have used a million times before so nothing wrong with the app) and suddenly it locked up and was unresponsive for a brief time, and then it just turned black/turned off without any shutdown or anything. Now I seem to be unable to turn the phone back on. And of course when I dock it nothing happens (since the phone is off). There are no signs that it is charging. I have had it since last June and am abroad where there aren't any Apple stores. Anyone have suggestions on things for me to try to bring it back to life? It's very odd because there had been nothing else out of the ordinary.