I entered the T'Rang Base and now i stand in front of a kind of Controlpanel. For red buttons are there. Three buttons turn into purple when i press them, the lower right one stays red, no matter what i do. Behind the T'Rang guy i see three doors where i could use my T'rang arm, but the way is blocked an i can`t open it. Can anyone help me? Thx guys

you're location is kinf of confusing so I can only tell you that coming in fromn the mines you'll have a few rooms to explore in an area with a pool of goo in the center of it. In one of those rooms, you'll find a pulse pick...an item that you can use to open any doors that won't readily open for you.

I think he's talking about the first T'rang base you get too, before the mine tunnels. One of those buttons opens a bin across the room. On the inside of the door cover for the bin you will see a patten, memorize it. I don't think you can do anything else in that room.