Gateway FX540 Reference Manual page 74

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CHAPTER 5: Upgrading Your Computer
Loosen the four screws that secure the heat sink to the
system board, then remove the heat sink. (The screws
cannot be completely removed.)
Caution
The heat sink has Thermal Interface Material (TIM) located on the
bottom of it. Use caution when you remove the old heat sink or unpack
the new heat sink so you do not damage the TIM.
Release the processor by pushing down on the lever,
then lifting the lever completely up.
Screws
Screws