Seriously?!?!?

Months ago I decided I will go to work sit in my corner, and do my job. Nothing more, nothing less. This morning I begin my day, all of a sudden my screen goes black. No green light, no connection. I check make sure my tower is still on, green light, then I go to the plugs, everything is fine. Next I go to my monitor, the cords are plugged, but just barely, one cord is unscrewed so much it's barely hanging in! My mind races back to 2 months ago when the same thing happened. At this point I'm so frustrated. I yell out "whoever keeps messing with my computer is really pissing me off" I reconnect everything, start up again, back to work. Few minutes later one of the girls I work with comes over, "is everything okay" "was the cords loose again?"
As my boss is leaving says " call me in 5 minutes" So I do. He proceeds to tell me, a while ago I intercepted an email from "the girl" saying she likes to mess with people she works with, and there computers to irritate them, what things could she do without causing damage. (Her friend is a computer programer.)I'm listening to him, getting more and more upset. My response to him is, well what are you going to do about it? This is unacceptable behavior. Tells me he wants to ask his lawyer buddies what his options are. Seriously!! Is it against the law to sit down, print out the email, and say " isn't this a strange quincedence, why are you behaving this way?"
I suppose what I'm most upset about is, WE ARE ADULTS. You have a problem with me, talk to me. We are not in junior high school. I can't imagine what I've done to piss her off. I literally stay quiet to myself, don't bother any of them unless it's work related. We always pretend to get a long. I think she's crazy, (which she has once again proved me right) My company has so many issues that go on behind the scenes, all of them I'm well aware of. Part of my job I guess you could say. People wouldn't believe some of the stuff that happens here, with no consequences. If my boss wont handle them, who am I to take control. So I sit in my corner. I told him today, "you know the expression, you've pushed my button, well I don't even have a button to push anymore. I'm done. When I can't even come in to my own corner space and sit to do my work without someone trying to sabotage me, what else can I do.....
I've personally decided that if this matter is not handled in an appropriate amount of time, being the position I'm in, it will show me my position is a joke, my company is a joke, and that now I am being made a joke. It's the principal. If you don't have control over your staff, in the end aren't they really running the show?