[CentOS] IP Problems - Address won't stick on reboots!

Centos 4.0
P4 Dual Xeon
2gig Ram
One 100mb NIC

The problem is that the nic won't hold a fixed IP address.  What I mean
is that if I refresh it, after booting up by typing "ifdown eth0" and
then "ifup eth0" - it then reflects the correct IP address.  However, it
won't 'have' and IP address upon boot.  Also, it seems to hang on the
logger service starting up.  It sits there attempting to start logger
for like 3-4 minutes (timed!).  I suspect this problem is most likely
related to the IP problem.

I've tried moving the network connection to a dedicated HUB and still no
luck.

What is the correct config file to edit to set the IP address correctly?
I tried editing the one in /etc/sysconfig/network-scripts - but that
didn't fix my problem.

Thanks.
Scott