You know I posted a long two paragraph response to this last week but couldn't post it.
I assume you are talking about the three Dvorak servers. You have to keep talking to the old man until he takes you over to the machine and tells you to activate it. Once you activate the main server, face the three smaller ones and you'll see a yellow light on one of them, that's the one you gotta activate first, then you'll see a yellow light on a second one and so on. Make sure you do it in the right order or else you'll have to start over.