If the Attention LED on the WD My Cloud Personal drive blinks yellow and does not turn blue, it indicates a problem with the network cable used. Proceed with the step-by-step instructions given here to resolve WD My Cloud Personal does not show Blue LED problem.
Solution 1 - Replace the Faulty Ethernet Cable
Solution 2 - Different Network Port
Solution 3 - Re-establish the Connection
Solution 4 - Direct Connection without the Ethernet Cable
Try to connect the WD drive directly to the router without using the network cable.
Solution 5 - Reset the WD drive