Lenovo H5s Series User Manual page 59

3. Position the computer cover on the chassis so that the rail guides on the
bottom of the computer cover engage the rails. Then, push the computer cover
closed until it snaps into position. Screw back the 2 screws on the chassis.
4. Reconnect the external cables and power cords to the computer. Refer to
"Locating connectors on the front of the computer" and "Locating connectors
on the rear of the computer".
Note: In most areas of the world, Lenovo requires the return of the
defective CRU. Information about this will come with the CRU or will come
a few days after the CRU arrives.
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User Guide