Can't Log in to the Launcher

All I can say is that, when I attempt to log in to the launcher (Old & New), it doesn't finish logging in and just keeps showing the loading bar. I uninstalled and reinstalled the launcher because it wouldn't let me use my account (As in the play button wouldn't load). Now I can't log in with it. What can I do? Also, I use Launcher Version 1.6.70. It didn't let me input that and 1.6.70 was the closest I could do.