My Z620 (refurbished system working ok otherwise) came with four SATA ports in use - 2 HDDs, one empty bay (not used) and DVD drive. I'm can't seem to get any devices working using the four additional SATA ports on the motherboard. I've attached a standard SATA cable but none of the drives I've attached (DVD, SSD) show up in Windows. When I connect the same drives to a working SATA port its OK (they do show up in Windows). Is there a SYSTEM / BIOS setting I need to change?