All the Mojang account servers are up and showing green. So that is not the problem...
If you have migrated your old minecraft.net account or if you started a new minecraft (mojang.com) account any time this year then you have to log in to your account with your email address and not your in-game username.
If you are unable to log into the launcher or minecraft.net directly here... https://minecraft.net/
Then you need to contact Mojang account service here...
My latest videos show you how to install Tale of Kingdoms for 1.6.4 and how to install IC2.
If you have migrated your old minecraft.net account or if you started a new minecraft (mojang.com) account any time this year then you have to log in to your account with your email address and not your in-game username.
If you are unable to log into the launcher or minecraft.net directly here... https://minecraft.net/
Then you need to contact Mojang account service here...
http://help.mojang.com/
My latest videos show you how to install Tale of Kingdoms for 1.6.4 and how to install IC2.