Dell OptiPlex 760 Service Manual page 187

3 release lever
10. Lower the heat sink onto the processor at a 45-degree angle so that one end of the heat sink fits securely under the tab opposite the release tab on
the retention base.
11. Re-assemble the shroud.
12. Replace the computer cover (see
13. Replace the cable cover, if used (see
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Replacing the Computer Cover).
Attaching the Cable Cover).