Replacing The Power Supply - Lenovo H520s Hardware Maintenance Manual

Step 6. Remove the memory module being replaced by opening the retaining clips as shown.
Step 7. Position the new memory module over the memory connector. Make sure the notch
memory module is correctly aligned with the connector key
memory module straight down into the connector until the retaining clips close.
Step 8. Reattach the computer cover.

Replacing the Power supply

Note: For this procedure, it helps to lay the computer flat.
To replace the Power supply:
Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating
system, and turn off the computer and all attached devices.
Step 2. Unplug all power cords from electrical outlets.
Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O)
cables, and any other cables that are connected to the computer. Refer to "Left and right view"
and "Rear view" for help with locating the various connectors.
Step 4. Remove the computer cover. Refer to "Removing the computer cover".
Step 5. Remove the front bezel. Refer to "Removing the front bezel".
Step 6. Disconnect the power cables from the connectors on motherboard.
Step 7. Remove the 3 screws that secure the Power supply to the chassis.
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Lenovo H520sHardware Maintenance Manual
2 on the system board. Push the
1 on the