When I try to play minecraft on this pc, it just goes into black screen. Here whats happened.

First I went to  minecraft.net, and downloaded the game. After I logged in in said "Cant connect to minecraft.net". Then i tryed the "force download" same thing.

Then I went the the website agian and clicked the "play in browser" and it downloaded the game, and went into some f***edup state, just froze, and if something passed the window it stayed there. Hard to tell ya how it was, But it just f***ed and dident work :S.

Then i tryed the normaly way agian. This time I was able to click "play offline" but, it just loaded 0.5 sec and went into black screen.

So now I was like WTF and then I went back to the website, and tryed the "play old version, but free" and it worked just fine. So its not my graphic card.

Any1 have any clue what the hell is wrong?

Thanks.