Lenovo ThinkCentre M71z Hardware Maintenance Manual page 106

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface. Hold the sides of your computer and
gently lay it down so that the screen is against the surface and the cover is facing up.
3. Remove the computer cover. See "Removing the computer cover" on page 94.
4. Locate the rear I/O assembly. See "FRU locations" on page 86.
5. Remove the two screws
Figure 20. Removing the two screws that secure the rear I/O assembly
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ThinkCentre Hardware Maintenance Manual
1 that secure the rear I/O assembly.