How do you turn on the little light bulbs on call of duty black ops zombies the first map?

in the "fives" map, you have to unlock the elevator and the Defcon 1 area below. then go down the stairs and unblock that area too. go to the next elevator and go down one more level. there will be halls and blood all over the place but keep going down the hall in front of you. there will be a few rooms ahead and one of them should have the lever to turn the power on.