HELP PLEASE!!! I'm trying to use my Apple TV in a dorm and it is just not working

I used this Apple TV at my house and it worked fine. Today, I brought it to my dorm and I don't know what's wrong. Everytime I try to turn home-sharing on it tells me "The Apple ID you have entered cound't be found or your password was incorrect..." I have typed the correct information in there 10 times and it refuses to work.

I am also unable to access Netflix, Hulu, Youtube, everything. The only 2 icons on the home screen are computer and settings.

I have a slow internet connection so I turned my video resolution down, and that did nothing.

I plugged in an ethernet cable and that did nothing.

I reset the entire system and that did nothing.

I have restarted this thing a dozen times and nothing has happened.

HELP ME!!!