Something strange as I have installed this twice and so far, after I do one install from the All included DVD, the system goes poof from the main boot. I think its something in Grub, but I only have trouble AFTER I've rebooted, shut down, and started again. I am unfortunately not familiar enough to track this issue down and am not sure why it happens after I've installed, set up, shut down, booted fine, shut down again, and then it goes blearf.
Basically, mdadm goes funny and can't find any Devices.
mdadm: No devices listed in /etc/mdadm/mdadm.conf
after that it gives a few modprobe lines, mount can't read /etc/fstab... anything else..etc.