X300s problems

More information.  The SSD works fine on two computers.  One with a Foxconn H67S motherboard and one with an ASUS P8H61-I motherboard.  The motherboard which it won’t work on is an ECS H77H2-M3.  The ECS motherboard has the latest BIOS and I’ve tried plugging the SSD into multiple ports (both SATA III and II).  I’ve also switched SATA cables and confirmed that other HDDs and SSDs work on this motherboard.  BTW, I’m also using a Xeon CPU, if that makes any difference.  Thanks again for any help you can offer!