How to make factory reset second time

I have a quastion!

Today i make factory reset (full) for my mybook live. I know that process take a hours, but my imac after two hours go to sleep mode and all process stoped (or maybe no, maybe this process is still going???) Now i can acces to dashboard http://mybooklive.local any more!!! Help

P.S.Sorry for my bad english!!!

Did it come back? 

It DOES take a long time, but the Mac shutting down won’t affect it.

Yes, its come back! :slight_smile: