Dell Alienware M17x R3 (Early 2011) - Manual (Page 23)

Hard Drive(s) 23
7 Tighten the three captive screws that secure the hard-drive assembly to the
computer base.
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.
10 Install the operating system for your computer, as needed.
11 Install the drivers and utilities for your computer, as needed.