Dell OptiPlex 980 Service Manual - Page 54

Slide the release lever from under the center-cover latch and rotate the release lever upward.

Page 54 highlights

5. Pivot the heat sink towards the back of the computer and remove it from the computer. 6. Slide the release lever from under the center-cover latch and rotate the release lever upward.

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5. Pivot the heat sink towards the back of the computer and remove it from the computer.
6. Slide the release lever from under the center-cover latch and rotate the release lever upward.