Why is my minecraft keep saying logging in every time i try logging in a server?

I have a mineshafter every thing went fine such as, single player and the options also the minecraft server info screen. But what I can't figure out is that its stuck on the screen "logging in" with the dirt background. It will stay like this forever and I have tried everything. By the way I have a Windows 8 Desktop. I'm running 1.7.4. Also I see that the server is online and I has all bars but when I click on it, it won't go through. I'm getting a premium minecraft account soon but I need help with this because I have a youtube channel and I don't want to not upload anything. Its so annoying and if you know how to fix it please help.