This sounds like bad hardware to me. Have you tried installing your CD set elsewhere?
Ok, so I made a memtest86 boot cd to test out this machine. At the moment it is 59% of the way through the testing and it's only found 7,016 memory errors, that's not that bad, right? :-) So bad hardware it is... not to get off on a tangent, but does anybody have any good reading links (or care to comment here) on why a BSD system would be more sensitive to bad RAM than a Windows server? I'm having a hard time thinking of Windows as more fault-tolerant than any OS, but it's pretty hard to deny the sudden change in crash frequency. Btw, I'm now 69% of the way through the testing and I've got 303,xxx memory errors. They are racking up so fast now I can't even read the number. I'm literally amazed that this box would run anything. Thanks to all who responded for the helpful prod, I (obviously) wouldn't have jumped straight to this conclusion without some nudging. Jeff