It's quite possible that it was not firmly plugged in at either the wall, the cord on the power brick, or (especially) in the back of the modem. Those barrel-shaped DIN plugs like what's in the back of the modem are usually pretty hard to fully seat into the socket - I would check that first.
* Disclaimer: I am a HughesNet customer and not a HughesNet employee. All of my comments are my own and do not necessarily represent HughesNet in any way.
