Hi,
The error with the password happened in Mageia 1. I typed the correct password, but but this warning appeared:

The warning says: The password typed is invalid.
Please try again.
I opened a terminal, typed the root password, and was accepted.
Then I tried to access any other application, and appeared error message
- Code: Select all
[user@localhost ~]$ su -
Password:
[root@localhost ~]# firestarter
(firestarter:3827): Gtk-WARNING **: cannot open display:
[root@localhost ~]# dolphin
unnamed app(3864): KUniqueApplication: Cannot find the D-Bus session server: "/usr/bin/dbus-launch terminated abnormally with the following error: Autolaunch error: X11 initialization failed.
"
unnamed app(3863): KUniqueApplication: Pipe closed unexpectedly.
[root@localhost ~]# kwrite
kwrite: cannot connect to X server
[root@localhost ~]#
I closed the session (log out). At the start of the new session, no error appears and everything returns to work correctly.