Minecraft won't load to main screen

I tried to launch Minecraft, and it went through until the white Mojang loading screen. The red loading bar fills up to about 80 percent before freezing, preventing me from getting on the main screen to play the game. I've tried reinstalling Minecraft, I've tried resetting the launcher, nothing works. It freezes the loading screen and I cannot get to the main screen to go onto my worlds. Please, fix this when you can.