返回成功，步骤如下：
1) Type 'su' and press enter in text mode interface.
3) Enter the root password - get into super user mode.
4) Type 'cp /etc/ttys /etc/ttys-original' - This make a back up copy of the file 'ttys' in the folder '/etc' incase you stuff something up.
5) Type 'edit /etc/ttys' - The file /etc/ttys is now open in the text editor.
6) Use the down arrow key till you get to the line that says:
tyv8 "/usr/local/bin/kdm" xterm off secure
7) Change this line to say:
tyv8 "/usr/local/bin/kdm" xterm on secure
8) To exit this editor, hold down the CTRL key and press the '[' key (the left-square-bracket key)
9) A dialogue box will open: Select 'a) leave editor' and select 'a) save changes' if you want to make your changes permanent (select 'b) no save' if you think you stuffed something up)
10) Type 'reboot'.
When reboot, X windows and KDM will start up automatically.
