Lenovo ThinkCentre M79 Hardware Maintenance Manual page 140

2. Remove the computer cover. See "Removing the computer cover" on page 103.
3. Locate the cover presence switch. See "Locating components" on page 31.
4. Disconnect the cover presence switch cable from the cover presence switch connector on the system
board. See "Locating parts on the system board" on page 34.
5. Remove the screw that secures the cover presence switch and remove the cover presence switch
from the chassis.
Figure 45. Removing the cover presence switch
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ThinkCentre M79 Hardware Maintenance Manual