mandrakes default is to not offer graphical login to the root user.
You'll have to log in as user, then open the kde control centre (configure my desktop), click on system, then login manager.
The window has a "administrator mode" button at the bottom. Click that, it should then ask you for your root password.
Once it's "fired up" in admin mode, you click the users tab, and you need to uncheck the box that makes certain account's hidden (it's usually root and "nobody"). You can change the icon for root there as well.
then apply any changes you make, and on reboot, you should be offered both root and user as graphical login options.
apart from that, Twili's suggestion is the best idea - the security thing is a good comment.
p.s. obviously, this is dependant on you using the default kde window manager. if you use gnome, I can't help/don't know. I also use kde and this is what I had to do to change things.
Last edited by bigjohn; 04-25-2004 at 05:08 AM.