Dell OptiPlex 170L User Manual page 113

1 drive alignment screws (2)
NOTE: Some computers come with only two extra alignment screws; others come with four. You only need two alignment screws for this procedure.
6. Gently slide the drive into place.
1 securing screw
2 alignment screws (2)
3 extra alignment screws (two on certain computers)
7. Once the drive is in place, apply pressure to ensure that the drive is fully seated.
8. Use the securing screw that came with the drive to attach the drive to the computer.
9. Connect the power cable to the system board.
NOTICE: When attaching the drive data cable, match the colored strip on the cable with pin 1 on the drive (pin 1 is marked as "1").
10. Locate the data cable from the CD or DVD drive in the upper drive bay and connect its middle data connector to the new drive.
11. Connect the power and audio cables to the drive.
12. Check all cable connections, and then fold the cables out of the way to provide airflow for the fan and cooling vents.
13. Reattach the front panel to the side hinges, and then rotate it until it snaps onto the front of the computer.