Maybe some additional steps would be useful to prevent swears and cries...
First, you SHOULD
really add a normal, regular user to log in with. The use of root account is really... dangerous. Nothing else to say about that.
useradd -g users -G audio,users -m -p PASSWORD -s /bin/bash YOURLOGIN
Second, you should review the excellent xorg.conf file and edit it according to your hardware and needs. Normally, and if you have a sufficient knowledge of X11 servers, you'll probably end up with a suitable xorg.conf in a couple of minutes. If not, I suggest you to use the xorgconfig utility which will help you step by step to configure the X11 server.
Third, edit inittab to enable the X11 server (and KDE) on boot :
and replace the following line :