Dell Alienware M14x R2 (Early 2012) - Manual (Page 80)

Procedure
1 Using the pull-tab, disconnect the display cable and the hard-drive cable
from the connectors on the system board.
2 Disconnect the logo-board cable, Bluetooth-card cable, coin-cell
battery cable, and subwoofer cable from the connectors on the
system board.
3 Remove the screws that secure the system board to the computer base.
System Board 82