I have a problem with a RAID5 array on Sil3114 controller on my DFI NF4 SIL Expert, Opteron 175 running XP pro. I set up 4 x 500gb Seagate hard drives as a RAID5 for extra storage safety, my OS is on 2 x 74gb Raptors as a RAID1 with a image of the OS array stored on the storage array. Last week the last drive on the RAID5 array started dropping out from time to time, I thought it may be the PSU so I upgraded it with a bigger one. When I restarted Windows stalled, I thought the Sil3114 controller may be rebuilding the drive that was dropping out so I left it all day but it never got into Windows. I hit restart and the next time it restarted the Sil RAID utility showed the first two drives as a Parity RAID but the third and forth drive as "Available". I restarted and went into the SilRAID Bios but it has the first two drives as "Invalid Raid Drives" and the other two as "Reserved Drives". I've spent the last week searching the net for a possible fix for the problem but still can't find what I can do. Can anyone help me out?