kde stopped working. Other window managers working fine

[mshmsh]

hi, I am using xorg with nvidia drivers and noticed that my kde has stopped working. I really dont remember the last changes that caused this since I am primarily a gnome user.
startx simply comes back to the command prompt.
Other window managers including gnome, fvwm,afterstep are all working fine.

How can I trouble shoot this. Where are the kde log files that I can look into?

I can see some horizontal lines flashing thro other wms every once in a while. I am running a GeForce 2 card at 1280x1024 resolution with color depth=16 on a 17" sony 200ES monitor

I looked at the Xorg.log file and the only difference is the extra lines I can see in the case of gnome (and other working wm):

[mildseven]

try commenting out all lines in xrog.conf pretaining to GLX, DRI etc (3D acceleration). if u can start it up that way, you can narrow down your problem to the opengl libraries. re emerginf nvidia-kernel and reading about opengl-update might help as well.