Don't worry, if you can login, that means the system is up. It just that you need to do some fine tuning that suit your needs. Slackware by default does not give you the X login screen. You can start the X with command:
However, you should try to configure X before try that command, coz' it will most likely start the X windows system in non-accel mode (which mean the X will behave _very_ slow).
You can configure X by typing command:
Save the file to /etc/X11/XF86Config. (Suggest backup the old file to another name before overwrite it).
Did you did a full installation?? There is a very useful ncurses utility that I always recommend new user who are not familiar with command line interface.
Just run it, you will know what I meant
If it is not installed, try install it. The package name is: mc-4.6.0-i386-1.tgz
ps: Slackware turn 10 today! Long live Slackware!