Attempting to rebuild SATA RAID 1

Hi all,

Hope someone can help...

I have an Asus P4G8X motherboard with Silicon Image 3112a Controller and I installed a set of new SATA hard drives a few weeks ago as a mirrored pair - everything worked fine. (Only drives in the system.)

Yesterday when booting up I got an error, "incomplete raid set" then before I could react the system booted into Windows XP Pro.

I was able to resolve that problem (I think) however when I access the RAID configuration utility and select rebuild nothing happens - no progress meter or anything?

Anyone have any experience with this controller on the P4G8X or other Asus MB?