Mailing the story:

My test box seems to like Debian-based distros and dislike Fedora and SUSE. I've never been able to get Fedora, SUSE to even boot, in fact, on this VIA C7-equipped ECS EVEm motherboard. Early in the booting process, the system resets itself, and just keeps rebooting, never getting anywhere. So on my test box, I give up, but both the Red Hat-derived CentOS 5.0 and Scientific Linux 5.0 do load in my Dell Optiplex 3 GHz Pentium 4 work box, on which I can explore them as live CDs but not actually install them to the hard drive.