Lenovo D400 Desktop IdeaCentre - Manual (Page 50)

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Hardware Maintenance Manual
4. Disconnect the power cables.
(1) Pry the retaining clip out (1) and detach the 8-pin power cable (2).
(2) Press down on the small tab on the 4-pin power cable (1) and pull the
cable out (2).
(3) Slide the system board tray out of the chassis. Refer to step 3 of the
“Replacing the memory module”.