Hi guys
Just bought a couple of netbox ac for an interconnecting link between two cities and also test their performance over a rural area link .
Setting up the link and routing -easy as pie- and leaving to office.
After a few minutes, the link is down. Logged with teamviewer to a local computer, winbox cannot even detect the mac (while before it could). Connected PoE straight to laptop, detects gigabit connection, but nothing more.
The local guy there (not really technical) tried to reset (hold down to button for few seconds), but the LEDs didnt even blink. It appears to be “just” switched on. It doesn’t reset to default or anything.
The only thing he noticed is that now the first LED is blue!
Does that mean something or is it just bricked?
Reason I am asking is that this location is really really far from where I am based and he cannot try netinstall. Any ideas? Has that occured to someone else in here?
Thanks a lot 
Since it is a critical link, have to make the 200km journey today to work it out. Not much luck
Tried netinstall with three different versions (just in case) of routeros, also with ticked and unticked “keep old configuration”. The procedure was almost successful, the package was transferred each time with an end result of “OK” in status column. Although, there is no reboot command available as it should be.
If I power off/on after that, it doesnt boot. Any thoughts? Why the heck it netinstalls, but hangs after that?
You should probably send a report of this to support and open a ticket - it doesn’t sound normal.
Small udpdate..
One more surprise, while I was playing around with the reset button, it came back to life! I logged in, did some changes and when I tried to reset, it doesnt boot again!
I’never experienced that with a routerboard product
Thank you for your answer. You think I can avoid a lengthy rma?
To me it looks like it should go straight to rma, but I know it is gonna take several weeks 
I’d ask what Mikrotik thinks before considering it to be an RMA situation. However, having a spare on hand is not a bad idea anyway, so perhaps you might just order another one and replace it, and let the RMA (or whatever fix needs to happen) take place at its own pace.