Gateway E-4400 - Manual (Page 41)

34 System Components
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.