Mine phone was working slow. I pulled out the battery and put it back in. It seemed to be stuck in the middle of booting up so i pulled the battery out again. When i put the battery back in and turned it on it went to a black screen which included text on the left hand side. It said something about the battery being ok and the plug into usb to program. When i plug into usb a little android guy appears with a yellow triangle. What do i do? It wont do anything else. Please help!