Simply doesn't work

The game simply doesn't work. I don't know what is wrong. I've searched far and wide and i have found absolutely nothing. The game wont even get past the loading screen if my internet is connected. My computer has to have no internet connection in order for me to play the game. The main reason i got the game is because it is fun AND all my friends can play together, so i want to join. But i cant play it. I thought it was something with my wifi router, but we got a new one and guess what? it STILL doesn't work. Mojang, is there something i can do to fix this?