englishal,
Last night I was moving a pair of WD Raptor Drives (on RAID 0) from an MSI K7N2 Delta-ILSR (nForce2 Ultra-400) to an ASUS A7N8X-E Deluxe (nForce2 Ultra-400) and it would not boot into Windows (WinXP Pro SP1). Then I tried the Repair and that would not make it either. I had to do an install on top of itself to get into Windows.
The interesting thing was I did not need to setup the RAID Array again though, the new Mobo saw it right off and took it as an active Array.
So it is a crap shoot each time.
Take Care,
Richard