Ok I don't know exactly where you are, but you're on the right track. You have to use two sets of terminals to get to where House is. Been a long time since I did it, so I'm a little fuzzy. The second terminal allows access to an elevator, which you use to get to house. There is a third terminal, which you can use to lift House up. Then you have a few options on there, or you can just run up and hit him with something.
Sorry for the vague :/ hope it helped a little though