Epson Endeavor Pro User Manual page 112

4. Make sure the holes in the cable connector fit over all the
pins; then push in the connector.
5. 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 .)
6. Align the notched corners of the power supply cable
connector with the notched corners of the drive's power
connector (such as the one shown below). Make sure the
holes Iit over all the pins and then push in the connector.
5-18 Installing and Removing Drives in the Slimline Computer
notched corners