Epson Endeavor 468C - Manual (Page 127)

When the hard disk drive ribbon cable is positioned
correctly, the red wire on the cable is aligned with pin 1 on
the drive connector. To identify pin 1, look for a 1 or 2 at the
connector on the drive’s circuit board.
Make sure the holes in the cable connector fit over all the
pins in the hard disk drive connector; then push in the cable
connector.
3. Locate one of the power supply cables that lead from the
power supply (behind the horizontal drive bays). The
power supply cables may be secured in a plastic band on
the side of the power supply. If so, unfasten the band to
access the cables; you can use any one that is free. (If your
drive requires a small power supply connector, use the
smaller one.)
5-24 Installing and Removing Drives