Booting Kubuntu 5.10 gets an "Out of Range" message

[Terry North]

I've just installed Kubuntu 5.10. Installation help directed me to
ubuntulinux.org whence I came to this list.  The boot loader lists
ubuntu as the first and default option and a "recovery" Ubuntu as
the second option. I cannot login to the GUI using either because:

1. The default boot loads Ubuntu (with screen display too faint
to read) and finishes with a blank screen with the message "Out of
Range".  The message is in a similar form to the "No Signal" which
the monitor displays before I boot the CPU.

2. The recovery mode loads Ubuntu (legible screen display) and
results in a command-line screen.  "login" enables me to login as
a user but I do not know how to get the GUI.  "kdm" gets me the
same "Out of Range" screen as the default mode.

What can I do to get the login manager?  Thanks (I hope).