1.) Double-check that your SSD is connected to port SATA3_0 or SATA3_1. See page 13 of your motherboard manual for the location of the port.
2.) Double-check that the port your SSD is connected to is in AHCI mode. See page 42 of your motherboard manual for instructions on setting the port to AHCI mode.
It is plugged into a SATA3 drive and it is in AHCI mode