Dell OptiPlex 170L - Manual (Page 121)

c. Insert the securing clip by placing the notched end of the clip opposite the tab into the slot on the retention base. Press the securing clip tab and
lower the securing clip into place. Make sure that the notched ends of the securing clip are secured in the retention base slots.
13. Lower the airflow shroud over the heat sink.
14. Reconnect the cooling fan power cable to the FAN connector on the system board.
15. Reconnect the power cable to the 12VPOWER connector on the system board.
16. Replace the computer cover .
17. Connect your computer and devices to electrical outlets, and turn them on.
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1 heat sink
2 retention base tab
3 retention base
1 securing clip
2 tab
3 slot
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.