Lenovo 90CS User Manual page 50

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