Switching off WD Book World Edition

For years I have my WD Book World Edition running 24/7 without any problem.

Recently I needed to replace the A HDD without any difficulty.

Currently I cannot connect to the WD Book World Edition be it through the IP- or  system level (Windows 8.1)

In trying to restart the WD’s I can’t switch the unit off. Even though I keep the switch pressed for 5 secs the unit stays on.

Front light blinks 3 / 6" which basically indicates “Standby” modus.

How can I reactivate the drives ?

Simply by pulling the power cable seems a bit rude to me ?

Any help is appreciated



Please see page 9 of the user manual related to the power button of the unit.