[CentOS] httpd won't start

I just upgraded one of my boxes to CentOS 3.5 and for some reason, httpd
won't start now.  It acts like it's going to, but the process just dies.  I
can't find anything in my logs that would indicate a problem:

>From /var/log/messages

Jun 10 00:16:53 austin httpd: httpd shutdown failed
Jun 10 00:16:54 austin httpd: httpd startup succeeded

>From /var/log/httpd/error_log

[Fri Jun 10 00:16:53 2005] [notice] core dump file size limit raised to
4294967295 bytes
[Fri Jun 10 00:16:54 2005] [notice] Digest: generating secret for digest
authentication ...
[Fri Jun 10 00:16:54 2005] [notice] Digest: done

I never get the "resuming normal operation" log entry though.  I have
commented out all vhosts and am stripped down to a minimal config.  Any
thoughts?

Mike