Lenovo 10KG Hardware Maintenance Manual page 104

3. Remove the two screws that secure the VESA mount bracket to the computer.
Figure 16. Removing the VESA mount bracket screws
4. Slide the computer from the front of the VESA mount bracket to remove the VESA mount bracket
from the computer.
Figure 17. Removing the VESA mount bracket
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ThinkCentre M600 Hardware Maintenance Manual