Re: Uninstalled KDE -> lost GUI
As for clues, does GRUB throw an error? GRUB should still be on the MBR. If all it removed was GDM you still should be able to muster a runlevel 3 boot and fix things with yum (no, you don't strictly need NetworkManager for networking).
My guess by running "yum groupremove" on the KDE group on my machine shows that yum removed GDM on you (which it shouldn't and that's asinine). Hopefully yum didn't go fully nuts and remove your kernel or yum itself.
When GRUB comes up, hit a key to stop it, hit "a" with your most recent kernel installed, and add 3 to the end (after a space).
Then try reinstalling GDM with yum (yum install gdm). While you're at it, if you want it, reinstall NetworkManager. While you're at it check that the GNOME group is still installed.
"What is freedom? To have the will to be responsible for one's self." - Stirner