Lenovo ThinkCentre M75n User Manual page 54

11. Install the power adapter into the power adapter bracket.
12. Install the power cord to the power adapter. See "Power adapter and power cord" on page 42.
13. Install the power adapter bracket to the wall mount bracket.
14. Install the screw to secure the power adapter bracket to the wall mount bracket.
15. Reconnect the external cables and power adapter to the corresponding connectors on the computer,
and then reconnect the power cord to the electrical outlet.
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ThinkCentre M75n User Guide