Gateway MAN FX510 Reference Manual page 76

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CHAPTER 4: Upgrading Your Computer
Loosen the four screws that secure the heat sink to the
system board, then remove the heat sink. (These screws
cannot be completely removed.)
Disconnect the power and data cables from the system
board, noting their locations and orientation. (You will
reconnect the cables after you install the new board.)
Remove the seven system board screws.
Screws
Screws
Screws