Lenovo H330 Hardware Replacement Manual page 17

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 "Locating connectors on the rear of the computer".
4. Remove the 3 screws that secure the computer cover at the rear of the
chassis.
5. Slide the computer cover to the rear of the chassis to remove.
Note: For this procedure, it helps to lay the computer flat.
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Hardware Replacement Guide