I've gotten as far as the communications array, but it has no power. I go out into the big area, but all those consoles have no power either. I take the elevator down beneath that and none of these consoles have power.

How do I restore power back?

There's a strategy guide on this. But is what you need to do is use the code in your datatablet. So if there's a red circle, green square, and blue triangle, on the top 'level' (red) put in the circle, hop down to green, put in your square, etc.

I spent a long time thinking that there was a sequence of red, sequence of green, etc, that I needed, doh.

-) wh|stler