Lenovo 5458 Installation And Service Manual page 279

4. Remove the 240 VA safety cover (see "Removing the 240 VA safety cover" on
page 259).
5. Loosen the cables from the cable tie.
6. Disconnect the power cables from the power connectors on the system board.
Figure 178. Power connectors
Attention: When disconnecting the power cable connector from the system
board, do not grab the wires. Grab the middle connector to vertically remove
the power cable connector from the system board.
Chapter 6. Removing and replacing server components
263