Hey there, morridm.
Good job on solving the problem! 
As for the WD’s power supply - it is 5V, 2A and it should be sufficient for the PiDrive kit alone, however for RPi 3 it is recommended that you go with a 5V, 2.5A power supply.
Cheers!
CK_WD
he tried that 
Yup, I know. Thanks for pointing it out though
I just wanted to clarify that if the power adapter provided from us (the 5V, 2A one) is working properly, then there should be no issue with the PiDrive kit. And that for the RPi 3, it’s officially recommended that you go with a 5V 2.5A power adapter, especially if there are a lot of peripherals. Which would mean that even if such a power adapter didn’t work (not to mention 4 of them) it would seem like the fault is not with any of them, as the user has already figured that out.
Anyway, the important thing is that everything is working properly.
