No disks found on ASUS P5N-D, nForce 750i.

[Michael Craft]

I have an ASUS P5N-D motherboard with an Nvidia nForce 750i chipset,
and a Seagate 500GB SATA 3.0Gb/s hard drive. When I try to install
FreeBSD 7.0 i386 from the bootonly CD, I get a "No disks found!" error
when it gets to the partitioning section.

Also strangely but probably just a coincidence, after I boot from the
FreeBSD CD, my Windows XP installation freezes at mup.sys and I need
to do a cold boot to fix it. Weird. Can anyone help?