Unfortunately it not so easy =(
I try this many times.
I Have Bios Ver. of RAID v220.127.116.112. (ICH10R/DO)
And I havent got RAID5 in list of Raid Level.
May be I must change bios ver. of my Raid controller but I didn't find any docs about it.
Have you tested all the drives?
Try different ports and SATA cables.