Epson Epson - Manual (Page 109)

5. Make sure the holes in the cable connector fit over all the
pins; then push in the connector.
6. Locate one of the power supply cables that lead from the
power supply. (They have multi-colored wires and a plastic
connector on the end.)
7. Position the power supply cable connector so that its
notched corners line up with the notched corners of the
power supply connector on the hard disk drive.
8. Make sure the holes fit over all the pins and then push in the
connector.
Installing and Removing Slimline Drives 5-11