Gateway FX540 Reference Manual page 68

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CHAPTER 5: Upgrading Your Computer
Disconnect the fan cable from the system board. The
location of the fan connection may vary, so trace the fan
cable from the fan to the system board.
Front fan connector
Remove the fan mount by pressing in on the flat area (1)
near the front, then rotating the fan mount (2) back.
1
Slide the old fan out of the fan mount.
2