Cannot boot properly: dbus problems?

[Nick Urbanik]

Dear Folks,

After a power surge and a spontaneous reboot, my 4-core F15 x86_64 machine
has been unhappy.  I have forced a selinux relabel, and a forcefsck.

Symptoms:
1. The graphical boot did not complete: it started Nagios, but cupsd
    failed to start, and gdm did not start up.
2. I cannot log in on the text consoles; I can type the username, but
    no prompt appears for the password.
3. Attempts to use sudo just hang.
4. I can log in by ssh as either myself or as root.
5. named is using "97.5%" CPU, though when I turn on querylogging,
    there are very few lookups.
6. Attempts to start cups result in complaints about dbus:
# systemctl start cups.service
Failed to get D-Bus connection: Failed to authenticate in time.

/var/log/messages says nothing of the matter.

Now systemctl is new to me, and I am not sure how to diagnose this.
I would be grateful for any suggestions.  Where should I look for
further clues?
-- 
Nick Urbanik http://nicku.org 808-71011 nick.urbanik at optusnet.com.au
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I disclaim, therefore I am.