I found out, that this could be a timing thing. After booting recovery mode, i started kdm, no problem. So i got the idea to insert a little sleep to the /etc/init.d/kdm script.............and it worked. After inserting a "sleep 3" to the script, i got no more hangups when booting my T21.
I found out, that this could be a timing thing. After booting recovery mode, i started kdm, no problem. So i got the idea to insert a little sleep to the /etc/init.d/kdm script. ....... .....and it worked. After inserting a "sleep 3" to the script, i got no more hangups when booting my T21.