I thought I had selected the correct driver during the install, but now when I try to get into KDE or any other GUI I get an error saying that the display signal is out of range for my monitor.
I'm sure MDK has some easy tools...but I don't know what they are. Maybe you can start by posting parts of your /etc/X11/XF86Config-4 file.
cat /etc/X11/XF86Config-4 | more
any of these should do the trick. Then just copy and post the sections "Monitor" and "Screen"