Powering FIO board

OK, I'm still having issues with the basics on my FIO board. I am trying to power it with a DC supply that is 4.5V/1A. I have attached it to the battery connector, which should be able to handle up to 12V. When I do this, the LED at the end of the board near the reset button flashes (about 1 second on/1 second off) and the board doesn't respond to anything. What am I doing wrong?