[CentOS] CentOS 4.2 issues

Hello CentOS,

I've just taken 2 old servers running CentOS 3.x, wiped it out, and installed CentOS 4.1

The systems seemed to work fine with CentOS 4.1, but when I proceeded to run yum -y update, all the RPM's (101) download and seem to install fine - however, upon reboot, partitions such as /usr/ and /var will not mount (ext3). These machines both use the Intel S875WP1 P4 Mainboards. Both use SATA Drives. One uses the promise controller (which on install seems to find a suitable driver).

Anyway, I've also tried installing directly from the CentOS 4.2 Server CD, same issue. Install goes fine, but bootup won't mount /var

Any idea what this is all about?