Gateway 450RGH Service Manual page 87

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Remove the four system board screws and the five system board hex nuts.
18
Short hex
nuts
While pushing in on the PC Card eject button, remove the system board.
19
Make sure that the rear I/O panel clears the bottom of the chassis (shown
by the top arrow) and the side audio jacks clear the bottom of the chassis
(shown by the left arrow).
Replacing the system board
Long hex nuts
Screws
Screw
83