Just got a NUC, the 4th gen i5. The first time I tired to plug it in, sparks shot out of the power adapter as it came into contact with the aluminum case. I'm assuming that this is not supposed to happen. The unit is working fine but I'm worried about unforeseen damage. It would be a seven hour round trip drive to the store to return the unit and there are no more in stock. What should I do with it? In the future I plan to put some sort of insulation around the metal case surrounding the power plug. Right now I'm afraid to unplug it for fear of it happening again next time I plug it in.
This definitely is not a very common situation but if this happened I would think there may be a problem with the AC adapter.
My recommendation is to contact the place of purchase if the unit is still under the first month of use or contact our Support Center.
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