Replacing The Graphic Card - Lenovo H520s Hardware Maintenance Manual

Step 8. Slide then lift the Power supply out of chassis.
Step 9. Install the new power supply：
a. Line up the holes on the new power supply with mounting holes on the rear of the chassis and
secure it to the chassis with the 3 screws.
b. Connect the power cables to the connectors on the motherboard.
Step 10. Reattach the front bezel, computer cover.

Replacing the graphic card

To replace the graphic card:
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".
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Chapter 8 Replacing hardware
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