When i click the big "Play" button, it goes to the Mojang screen to load. But it just doesn't load, it just stays on the Mojang screen.

When i click the Minecraft icon, the Minecraft launcher comes up. Everything is normal on that screen. When you click play, the launcher boots up just like normal. Everything is normal until it gets to the loading screen where it has the big "MOJANG" icon on the screen. It won't even load to the screen where it says "Singleplayer, Multiplayer and Realms". Then, it says its "Not responding and then i have to go to task manager to close it down. Please help me! Thanks!