Can't start up the FreeBSD install disk on dual Xeon Nocona rig (it works on other systems)

[Chandler May]

Hi!

I just recently switched to FreeBSD on my primary computer, an Intel
Pentium 4 Prescott rig, and I'm loving it. I came from Gentoo Linux,
and, if at all possible, I never want to go back.

Just a few days ago I set up a dual Intel Xeon Nocona system on the
Tyan i7520 (S5360) motherboard. Gentoo Linux installed flawlessly on
it, but when I tried FreeBSD, the install disk stopped before it had
even fully started. When I select "Verbose Logging" from the start-up
menu, it stops immediately after these four lines come up:

atkbdc0: <Keyboard Controller (i8042)> port 0x64, 0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbdc: RESET_KBD return code:00fa
kbdc: RESET_KBD return status:00aa

I've let it run for hours, but it never gets beyond that point. I'm
definitely new to FreeBSD, but I'm relatively familiar with computers
in general, so the first line of that message tipped me off, and I
decided to try to boot it with ACPI disabled. I did, but it still
stopped. Here is the last line that was shown before it stopped:

cpu0 on motherboard

Does anyone know why this is happening and/or has a solution to solve it?

Chandler