# Help me understand why my NUC keeps becoming unavailable? **URL:** \ **Category:** Tinkering\ **Created:** [February 10, 2021, 6:10pm UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893 "2021-02-10T18:10:58Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![AlanTS](https://community.roonlabs.com/letter_avatar/alants/32/5_5575768a8748004e209b776fc1b2916d.png) [@AlanTS](https://community.roonlabs.com/u/AlanTS)\ **Post date:** [February 10, 2021, 6:10pm UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893/1 "2021-02-10T18:10:58Z")
Hi all. I’ve been running my Roon core on a NUC 7i7DNH1E for about a year; in the last month or so it started to behave unexpectedly: Every few days, but sometimes more often and sometimes less often, I fire up Roon and it can’t find my core. The NUC won’t allow an incoming remote desktop connection, and indeed the router shows that it’s no longer connected to my network. To troubleshoot, I hook up a monitor/kb/mouse (it’s running headless) but it never sends any video output in this state, either, so I can’t observe if there’s something obvious. Inevitably, I just power cycle it, and it reconnects, finds the monitor again, loads up Roon, and things appear back to normal. It’s additionally hard to troubleshoot because it’s erratic. I’ve tried adjustments to the power modes, ensuring that it doesn’t sleep, etc; but have to wait a few days before I see if it’s had any effect. I’ve swapped it from ethernet to wifi and vice-versa. I’ve made sure that my profile was properly logging in after updates, so that it wasn’t getting hung up in some “finishing update” state, so I don’t think that’s the cause. The fact that it’s not sending video output (or perhaps it’s not even recognizing the KB/mouse input) or appearing on the network makes me think maybe something is up in the BIOS, perhaps after what would otherwise be a routine windows event like a patch-restart. But I really don’t know what to look for, and am particularly puzzled that this didn’t happen for nine months or so – what changed? I really don’t know. Anybody have any ideas what I should try? I’m open to just about anything! ---
**Author:** ![ipeverywhere](https://community.roonlabs.com/user_avatar/community.roonlabs.com/ipeverywhere/32/288113_2.png) [@ipeverywhere](https://community.roonlabs.com/u/ipeverywhere)\ **Post date:** [February 11, 2021, 12:54am UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893/2 "2021-02-11T00:54:46Z")
Are you running ROCK? Or some other OS? From your short description its sounds like something is causing it to lock-up hard. That can a number of things including overheating, disk errors, memory errors, etc. Need to know more about the set-up, OS, memory, drive configuration, etc. What can change in 9 months? Hardware failure sadly. But… provide more and the community will dive-in I’m sure. ---
**Author:** ![AlanTS](https://community.roonlabs.com/letter_avatar/alants/32/5_5575768a8748004e209b776fc1b2916d.png) [@AlanTS](https://community.roonlabs.com/u/AlanTS)\ **Post date:** [February 11, 2021, 3:56am UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893/3 "2021-02-11T03:56:16Z")
Ah, thanks @ipeverywhere, I should have noted: My NUC is running Windows 10 pro. | component | details | | --- | --- | | OS | Build 19042 | | Processor | Intel(R) Core™ i7-8650U CPU @ 1.90GHz 2.11 GHz | | Installed RAM | 16.0 GB (15.9 GB usable) | | Disk 1 | 1TB Samsung M.2 - boot/OS/apps | | Disk 2 | 500GB SSD - library/storage | I did a little more spelunking tonight. Chkdsk turns up no bad sectors on either disk. Then I ran a memory test; the windows log says this produced no errors. BUT: the NUC didn’t come back up successfully when restarting after the post-test reboot. I started exploring the events viewer around the time the memory test was completed and see a bunch of warnings like this: > The application-specific permission settings do not grant Local Launch permission for the COM Server application with CLSID > Windows.SecurityCenter.WscDataProtection > and APPID > Unavailable > to the user NT AUTHORITY\SYSTEM SID (S-1-5-18) from address LocalHost (Using LRPC) running in the application container Unavailable SID (Unavailable). This security permission can be modified using the Component Services administrative tool. This is where the guts of Windows are way beyond me. I see clusters of errors like that which _might_ correspond in time to the NUC going dark on me. But I’ll never figure out what to do about them using the Component Services admin tool. So — maybe I’ve found something? ---
**Author:** ![ipeverywhere](https://community.roonlabs.com/user_avatar/community.roonlabs.com/ipeverywhere/32/288113_2.png) [@ipeverywhere](https://community.roonlabs.com/u/ipeverywhere)\ **Post date:** [February 11, 2021, 4:03am UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893/4 "2021-02-11T04:03:15Z")
Good hunting… also beyond my Windows Foo ☹ I’d say switch to Linux but that’d be rude. I’d still assume hardware error but hopeful someone with deeper Windows experience will jump in. ---
**Author:** ![Rugby](https://community.roonlabs.com/user_avatar/community.roonlabs.com/rugby/32/360588_2.png) [@Rugby](https://community.roonlabs.com/u/Rugby)\ **Post date:** [February 11, 2021, 5:10am UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893/5 "2021-02-11T05:10:31Z")
> [@AlanTS](#): > > So — maybe I’ve found something? Nope, those are Windows useless errors and mean nothing. The errors are by design and are harmless. So, not the issue. I’d run a OS drive test. ---
**Author:** ![AlanTS](https://community.roonlabs.com/letter_avatar/alants/32/5_5575768a8748004e209b776fc1b2916d.png) [@AlanTS](https://community.roonlabs.com/u/AlanTS)\ **Post date:** [February 11, 2021, 2:44pm UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893/6 "2021-02-11T14:44:21Z")
> [@ipeverywhere](#): > > I’d say switch to Linux but that’d be rude. Oh, I’m thinking about that, already! I have plenty of room to dual boot and try it out. Should probably make sure I’m not dealing with something in hardware, first, but this is definitely on the list. ---
**Author:** ![AlanTS](https://community.roonlabs.com/letter_avatar/alants/32/5_5575768a8748004e209b776fc1b2916d.png) [@AlanTS](https://community.roonlabs.com/u/AlanTS)\ **Post date:** [February 11, 2021, 2:45pm UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893/7 "2021-02-11T14:45:39Z")
> [@Rugby](#): > > I’d run a OS drive test. Thanks, Rugby. By this, do you mean something beyond chkdsk? That didn’t turn up anything. ---
**Author:** ![Rugby](https://community.roonlabs.com/user_avatar/community.roonlabs.com/rugby/32/360588_2.png) [@Rugby](https://community.roonlabs.com/u/Rugby)\ **Post date:** [February 11, 2021, 8:27pm UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893/8 "2021-02-11T20:27:32Z")
No, I meant chkdsk. Check to see if there is an awaiting Microsoft update. Sometimes, a waiting update can cause system weirdness. ---
**Author:** ![AlanTS](https://community.roonlabs.com/letter_avatar/alants/32/5_5575768a8748004e209b776fc1b2916d.png) [@AlanTS](https://community.roonlabs.com/u/AlanTS)\ **Post date:** [February 15, 2021, 4:55pm UTC](https://community.roonlabs.com/t/help-me-understand-why-my-nuc-keeps-becoming-unavailable/141893/9 "2021-02-15T16:55:48Z")
I’ve had the NUC hooked up to a spare monitor for the weekend and wandered past it in the middle of the night to find a blue screen of death proclaiming a WHEA UNCORRECTABLE ERROR, which apparently is a pretty broad category but at least gives me something to hunt for.