Just curious, have you tried any of the newer BIOSes? If so did the drive work in the other slot before the update? My board had a new BIOS released this month that looks to be a significant update with an AGESA update. It's possible that there is an interaction with the BIOS version and the drive. I have only ever seen new BIOSes fix things, but since they improve performance it is possible that they "find" a weakness in a marginal component.