My corei5 sky lake nuc is working fine. Just curious about a noise that it makes. It is not fan noise because it is a constant. It sounds like a noise that would come out of an old refrigerator. Is this normal?
Mine nuc6i5syk is dead quiet when powered on, so i would definately say that this is not normal. If i were you i would have opened it up just to see if it look ok (not burned or smells burned) , or just rma it.
I also have nuc5i5 and never had this happening at all.