Dell OptiPlex SX260 - Manual (Page 8)

6 Replacing the System Board
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13 Remove the I/O shield:
a Turn the system board upside down.
b Carefully insert a blunt, nonconducting object such as a plastic
screwdriver under the I/O shield and pry the shield away from the
system board until the shield dislodges from the system board.
14 Attach the I/O shield to the replacement system board:
a Align the two flanged screw mounts on the I/O shield with the two
screw holes on the system board.
b Rotate the I/O shield toward the system board and snap the I/O
shield into place.
c Replace the two screws that you removed in step 12.