Dell Inspiron M421R (Late 2012) - Manual (Page 106)

105 | Removing the Processor Heat-Sink
Procedure
1 Turn the system-board assembly over.
2 In sequential order (indicated on the processor heat-sink), loosen the captive
screws that secure the processor heat-sink to the system board.
3 Lift the processor heat-sink off the system board.
1 processor heat-sink 2 captive screws (6)
2
1
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