Lenovo ThinkCentre M90n-1 Hardware Maintenance Manual page 67

4. Remove the screw that secures the VESA mount bracket to the wall mount bracket.
5. Remove the VESA mount bracket from the wall mount bracket.
6. Turn over the computer so that the bottom cover is facing up.
7. Remove the VESA mount bracket from the computer.
8. Install the VESA mount bracket to the computer.
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Chapter 6 Hardware removal and installation