Dell OptiPlex SX260 - Manual (Page 6)

4 Replacing the System Board
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e Heat sink
f Chassis intrusion switch
9 Remove the heat-sink retention base by removing the four green
screws that secure the retention base to the chassis.
10 Remove the five silver screws that secure the system board to the
chassis.
NOTICE: The module device connector is attached underneath the system
board. When removing the system board, be careful not to bump or catch the
connector on the metal chassis floor.
11 Remove the system board and I/O shield assembly by slightly sliding
the board toward the front of the computer and lifting up.
green retention
base screws (4)
silver system board
screws (5)