WD DX4000 Startup Failed

This is a community forum, meaning users.  You should open a support case if you need WD.

If it was me the first thin I would do is copy my data to a USB drive so I did not loose anything. I am not sure how you got to a startup error if it was on and rebuilding.  Does the server have a UPS?  Could the power have gone out to force a restart?

Don’t know, perhaps the replacement drive is bad?