Dell Alienware M14x R2 (Early 2012) - Manual (Page 83)

17 Replace the base cover. See "Replacing the Base Cover" on page 16)
18 Replace any cards or blank that you removed from the 9-in-1 Media Card
reader.
19 Follow the instructions in "After Working Inside Your Computer" on page13.
Entering the Service Tag in the BIOS
1 Ensure that the AC adapter is plugged in and that the main battery is
installed properly.
2 Turn on the computer.
3 Press <F2> during POST to enter the system setup program.
4 Navigate to the Security tab and enter the service tag in the
Set Service Tag field.
System Board 85