Dell OptiPlex 755 - Page 265

Processor 265
15 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.
16 Re-assemble the shroud.
17 Replace the computer cover (see "Replacing the Computer Cover" on page 317).
18 Replace the cable cover, if used (see "Cable Cover (Optional)" on page 237).
1 heat sink
2 retention base
3 release lever
1
3
2