When holding the on button with it charged and disconnected from power, it will only quickly flash/blink the at&t logo w/world phone screen.
When charging, the best it will do is show the battery icon with the bottom four icons lighted. I have charged it overnight. The four lighted icons do nothing, only dim when touched and the battery icon stays on screen.
I have gotten to the recovery menu using the three button method, then choose "boot up" (I believe it was). Still continues the same.
I have tried removing and reinstalling the battery.