Gateway E-4400 System Manual page 41

To install the system board:
1
If installing a new system board, mount the rails (removed in Step 9
above) on the bottom of new board.
2
Align the rails located underneath the system board with the guides on
the chassis, and slide the system board into the chassis.
3
Push in the release lever until it is parallel with the chassis. This will
complete the reinstallation and lock the board in place.
4
Reconnect peripherals, the modem cord, and the power cord, then turn
on the system.
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System Components