Lenovo 3000 C305 All-In-One - Manual (Page 68)

Hardware Maintenance Manual
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6. Reconnect the external cables and power cords into the computer.
Refer to “Locating components and connectors” .
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.