Dell Alienware M17x R3 (Early 2011) - Manual (Page 65)

WirelessHD Card (Optional) 65
7 Replace the center control cover (see "Replacing the Center Control
Cover" on page 52).
8 Replace the compartment door (see "Replacing the Compartment Door"
on page 16).
9 Replace the battery pack (see "Replacing the Battery Pack" on page 14).
CAUTION: Before turning on the computer, replace all screws and ensure that no
stray screws remain inside the computer. Failure to do so may result in damage to
the computer.