Lenovo ThinkCentre M90n-1 Hardware Maintenance Manual page 90

12. Install the heat sink.
13. Reinstall all removed parts.
14. Reconnect the external cables and power adapter to the corresponding connectors on the computer,
and then reconnect the power cord to the electrical outlet.
Note: If a locking device is available, use it to lock the computer.
84
M90n-1 Hardware Maintenance Manual