yes, it is slackware 13.0 and yes i have X installed because I downloaded full slackware dvd.iso and during the installation process i chose to install EVERYTHING. so i'm pretty sure that it is installed.
My video card is ATI Radeon X1600.
I've also tried xorgsetup but still nothing.
I'm going to try samac's solution and I'll keep you in touch.
Oh and one more question.
Does this xorg.conf file (which i got from command:
) needs to be in /etc/X11 under the name xorg.conf or xorg.conf.new.
In my case it is xorg.conf.new in /etc/X11 .
EDIT: Thanks to everyone for such great and lighting fast answers. You are really GREAT!