This happens to me all the time. The exact answer...i'm not quite sure but what I did was I went on to play but it said user name or password incorrect. I carefully typed it again and the same message again. So i logged of then tried again a couple hours later then i was on! But if it wont log you on a couple hours later just try the next day and if that dosen't work make a new account.
Someone has hacked you and changed your password.
you cant
you cant
you cant
You cant.
U cant
you cant
no you cant B)
you cant
you cant
as far as i know you cant
i cant do it
u cant