I think I've found the solution.
I set the boot up order in the Bios to SATA and it boots up perfectly.
Previously it was set as SCSI , as instructed in the Motherboard manual as being necessary when running Raid on the IDE's (which I am).
By doing this you see the SIS SATA bios load and then the RAID drivers.
I'm suprised by this as the SATA disk does not contain the O/S it is just plain data. The O/S is on the Raid IDE array.
I can only assume the Motherboard always looks at SATA disks first whenever there is one connected and unless you specify this in the Bios boot order it doesn't recognise it. (The first boot device, rather than 'boot order', is still set at SCSI however).
I set the boot up order in the Bios to SATA and it boots up perfectly.
Previously it was set as SCSI , as instructed in the Motherboard manual as being necessary when running Raid on the IDE's (which I am).
By doing this you see the SIS SATA bios load and then the RAID drivers.
I'm suprised by this as the SATA disk does not contain the O/S it is just plain data. The O/S is on the Raid IDE array.
I can only assume the Motherboard always looks at SATA disks first whenever there is one connected and unless you specify this in the Bios boot order it doesn't recognise it. (The first boot device, rather than 'boot order', is still set at SCSI however).