Howto: Login screen gone [solution in openSUSE (kde4)]

Howto:
There are two ways to sort out this type of issues, If your login screen gone, and you can't see your login screen anymore.

1st Solution is:
1- Login with your username and password from command based screen.(You can use failsafe OR your normal one).
2- type:

startx

Hit enter, and you will be able to go to desktop.
3- After this, change the theme from YaST->system->/etc/sysconfig Editor->Desktop->Display manager->DISPLAYMANAGER_KDM_THEME.
There will be two DISPLAYMANAGER_KDM_THEME, choose the middle one.
and enter your desired working theme name and hit ok.
4- Logout from here.
5- Restart.

2nd Solution is:
1- Login with root from command based screen.(You can use failsafe OR your normal one).
2- type this:

vi /etc/sysconfig/displaymanager

3- search for line like this:
DISPLAYMANAGER_KDM_THEME = "true-nature"
true-nature is theme name.just for example i put it there.
4- Change it to your desired one:
DISPLAYMANAGER_KDM_THEME = "oxygen"
5- Save the file.
6- Reboot.
Howto save in vi: To change any text, use 'i' to insert any text, hit ESC to end writing, and then hold left shift+z(hit twice). And your changes will be saved.

And that's it. You are done.

ANL