I had it originally attached to an Audioquest Surge/Power Conditioner which I had attached to a UPS. The power outages were more of multiple flashes of power, which were too fast, I believe for the Surge/Power Conditioner combo to handle. I have moved the Nucleus directly to the UPS now. But, I have had no luck trying to load the Core.
Since your Nucleus is showing up as ROCK might mean you have a corrupted file somewhere in Roon. I know that when you install a new M.2 drive and install Roon, it shows up as ROCK until Roon @support works their magic to install the passive cooling tweak.
I would plug the Nucleus into a TV or monitor and see what message you get on the screen. That might tell you if there is a hardware issue. If not, it’s possible you could do a full reinstall of Roon from scratch. I would not do that until @support gets involved.
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I wish support would get involved. I would like to know if I need to send the unit in for repair or if it’s some fix they can do remotely. To me the box needs a reset. Unfortunately, the Nucleus doesn’t come with a reset button.
The first thing support will ask you is to do exactly what two fellow users suggested.
Do you have a specific reason that makes you hesitate?
It may be a bit of a hassle to fiddle with cables and various equipment, but ultimately, all you need to do is connect the Nucleus to a TV with HDMI and connect a USB keyboard to the Nucleus.
After that you will know more, and so will the support team. Without this procedure, nobody can know what’s going on, in any way.
Pinging @support for you again.
They will but they don’t work on a weekend and in any case will probably take longer until they get to you because they don’t have enough staff and are working through the queue one after the other
I tried the reset network instructions. My TV had part of the dialog off the screen, so I had to hope part of what I typed that didn’t show was typed correctly. It looked like it reset. I connected it back to my network and ran arp -a and the 192.168.1.66 was no longer in the arp table.
I reloaded the Roon Software (previously did an uninstall to start fresh). I then started Roon and it still didn’t find the Core. I selected help and typed the 192.168.1.66 address in and the address then showed up in the arp table.
I’m still stuck on the “looking for the core” screen. I will keep letting it run, but resetnetwork doesn’t seem to have fixed the problem.
Hello John, I’m sorry about that because it’s not a good sign. Roon support will be able to see when your Nucleus was last active and reachable for the Roon servers.
Maybe you can add the info when you bought the Nucleus, if it’s still under warranty.
@Suedkiez, @John_Lee2 - I’ve seen a couple of reports like this in the forum before: a power outage corrupts a Nucleus and it starts identifying itself as a ROCK installation. I fear that @support will definitely need to get involved here; I don’t think we can fix it ourselves.
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I think that’s exactly the problem. The good news is it’s relatively easy to install ROCK on Nucleus and then Roon @support migrates from ROCK to Nucleus.
While true, of course, even if it thinks it’s a Rock it should probably still be discoverable and working, so I guess there might be two separate issues
No, I’m not saying it’s just the ROCK to Nucleus file that’s corrupted. I’m saying something about Roon is corrupted and can be resolved with a new install. The fact that it identifies as ROCK is just a symptom that something is wrong. This is all speculation, of course.
Right, good point. Whatever corrupted the file(s) identifying it as a Nucleus may well have corrupted other things leading to the not working issue 
How do I get support to look at the problem? I’ve been without a working Nucleus for almost a week now. By the way thanks for your help in trying to fix my problem.
By patience 
They are trying to keep up. You had the problem for a week but your thread has been there for two days over a weekend. It’s in the right place here in Nucleus Support and they will see it
Appreciated 
Hey @John_Lee2,
Thanks for your patience while we continue to work through each thread! I see a few community experts have provided some excellent next steps here, you’re in good hands!
That said, we haven’t seen your Nucleus online in the last 4 days. Taking a few steps back, when you do plug in your Nucluus to a monitor via HDMI, what do you see? Are you able to pull up the webUI?
If possible, could you share a screenshot, similar to what you see via our help article:
As a few have mentioned here, it isn’t the end of the world if your Nucleus is identifying as a ROCK. It’s certainly odd (but then again, power outages can cause all sorts of weird things) but we do have the ability to re-flash the Nucleus OS back to the core easily. I’m hoping we can get to that point!
How can we start this fix, I’m ready.
John
I can’t get to the Roon OS Web. I can’t get to anything involving the Nucleus.
The Serial # on the Bottom of the unit is54B2039877CA
Nucleus Rev B
Roon v2.0 (build 1211) production on windows
If you look through the thread I tried everything suggested and I did the resetnetwork fix and nothing works. I took the Nucleus to a TV set to do the resetnetwork. So no screen shots are available of that effort.
Can you take a phone picture or write down what you see and post it here.
