Lenovo ThinkCentre M75n Hardware Maintenance Manual page 96

4. Remove the screw that secures the power adapter bracket to the wall mount bracket.
5. Remove the power adapter bracket from the wall mount bracket.
6. Remove the power cord from the power adapter. See "Power adapter and power cord" on page 84.
7. Remove the power adapter from the power adapter bracket.
8. Turn over the computer so that the bottom cover is facing up.
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ThinkCentre M75nHardware Maintenance Manual