Unplug all power cords from electrical outlets.
Disconnect all cables attached to the computer. This includes power cords, input/output (I/O)
cables, and any other cables that are connected to the computer. Refer to "Left and right view"
and "Rear view" for help with locating the various connectors.
Remove the rear cover. Refer to "Removing the rear cover".
Remove the computer stand. Refer to "Removing the computer stand".
Remove the optical drive. Refer to "Replacing the optical drive".
Remove the middle cover. Refer to "Removing the middle cover".
Remove the EMI cover. Refer to "Removing the EMI cover".
Remove the system fans. Refer to "Replacing the system fans".
Step 10. Remove the 2 screws that secure the system fan supporting bracket and lift up the supporting
bracket to remove it.