Gateway GT4015 Hardware Reference Manual page 34

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Remove the fan by pulling it away from the system board.
5
Disconnect the fan cable from the system board.
6
Find the memory module banks on your system board.
7
Gently pull the plastic tabs away from the sides of the memory modules,
8
then remove them.
Disconnect the power and data cables from the system board, noting their
9
locations and orientation. (You will reconnect the cables after you install
the new board.)
Replacing the system board
31