[ssi]

I missed the post where you said the lights on the controllers were on (I am used to a mix of lighted and non-lighted controllers).

Micheal's suggestion to verify the connection between the brick and the first controller is good. I would expand that to include verifying that all data cables are connected properly (fully inserted and in the correct order). I would also double check that all the power wires between controllers are good also. It may help to put the robot up on blocks, command it to move and then wiggle all wires plugged into the controllers to verify that you don't have a loose connection.