suse not 5 year old proof

just got 7.1 installed and setup on my home system. Whilst it was starting up my son was stabbing the keyboard typing random characters. When KDM started it apeared for a moment and then returned to text mode. I've gone through XFree86 setups, yast and sax but can''t get it back. If I manually run KDM it just does the same thing, typing startx just gives me a blank desktop with a mouse pointer, I can't see any errors to sugest what is wrong and short of a reinstall I'm not sure what to do. Not much of a linux guru you see. Any ideas? Thanks Matt