drop into command line mode, and try to star kde directly (without KDM).
ctrl+alt+F2 (or F6 / F5 in slackware)
login as root
telinit 3
exit
(login as normal user)
echo "startkde" > .xinitrc (dont iss the dot)
startx
does that work ?
if not, what does the error message say ?
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