FreeBSD 6.0 Installed on Adaptec 2100S RAID 5 But Won't Boot

[Derek Flenniken]

I am able to install with no problems. RAID5 "Drive" is visible for 
slice creation, partition.

Use Entire Disk + Set Bootable
FreeBSD Boot Manager
Default Partition Scheme

If I install again I see my slice and partitions from the previous install.

I've gone through the configurations with the 2100S and can't find 
anything wrong with the settings.

System POSTs, 2100S POSTs, then blinking cursor for a while and finally 
a No OS message.

Any ideas?