HDD not detected using Asus USB 3.0 Expansion card U3S6

Asus USB 3.0 expansion card installed connected to PCI Express 4 slot
2 x 2TB Samsung Disks installed in External 'Icy Box' HDD Enclosure.
Enclosure connected to new USB 3.0 input.

Bios reports Hard Disk not found and not shown in Windows My Computer :cry
Both disks however show in Device Manager?
Using Windows XP Service Pack 2 on Pentium(R) D 4 years old.

A Buffalo external drive was previously automatically detected via USB 2.0?

Do I need to go into the CMOS settings if so which setting?

Help will be much appreciated.
Graham