Dell Alienware Area-51 Service Manual page 42

Figure 19. Removing the I/O board
a. cables
b. I/O board
3. Remove the five screws (#6-32x6) that secure the I/O board to the chassis.
4. Slide and lift the I/O board out of the chassis.
Figure 20. Removing the I/O board
a. I/O board
b. screws (5)
42 Removing the I/O board