Epson Endeavor 468C - Manual (Page 126)

Make sure the cable connector fits properly onto the drive
connector and push it into place. Be careful to align the
connector correctly; otherwise, you could severely damage
your drive when you push it in. Go to step 3.
2. Locate the hard disk drive ribbon cable. If you are installing
a second hard disk drive, one end of the cable is connected
to the system board and the other end is connected to the
first hard disk drive in the vertical drive bay; use the free
middle cable connector to connect the second hard disk
drive as described below.
If you are installing your computer’s first hard disk drive,
you need to connect the hard disk drive ribbon cable to the
system board now. Follow the instructions on page 5-30
and then use the middle cable connector to connect the hard
disk drive as described below.
Notice the small tab in the middle of the cable connector;
align this tab with the notch in the hard disk drive
connector, as shown below.
notch
power supply
socket
red
wire
Installing and Removing Drives 5-23