Got P6T WS Pro and put Intel's SSD as bootable drive and planned to have 2 WD1001FALS as RAID1. When I change Storage Configuration to RAID after restart I cannot even get to POST and diagnostic card shows 38 (USB Initialization). I don't have any USB devices (disconnected mouse) and keyboard is on PS/2.
I had to clear CMOS before I could get to BIOS again. And I double checked - single change of Storage Configuration brings the system to halt.
by trying different things, I figured out that my LG blu ray drive causes that conflict. I disconnect it - everything works, connect it - halts. Now I am looking if I will be able to figure out how to fix that otherwise, blu ray will go back to store.