Alienware Area-51 R3 Threadripper Edition Service Manual page 60

2 Disconnect all cables from the I/O board.
NOTE: Note the routing of all cables as you remove them so that
you can route them correctly after you replace the I/O board.
Figure 20. Removing the I/O board
1 cables
3 Remove the five screws (#6-32x6) that secure the I/O board to the chassis.
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2 I/O board