Epson Endeavor - Manual (Page 100)

Note
When the hard disk drive ribbon cable is positioned
correctly, the red wire on the cable is next to the power
supply connector on the hard disk drive, as shown above.
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.
Caution
If you do not correctly align the holes with the pins, you
could severely damage your hard disk drive when you
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
loosen the cables.
The cables are labelled PA, PB, PC, and PD; you can use any
one that is free. (If your drive requires a small power
supply connector, use PD.)
Installing and Removing Drives 3-27