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Hhmmm, never use a USB hub that is not self-powered (i.e. has its own, separate power supply). Do not rely on the NUC to provide enough power for the multiple devices plugged into a hub.
If this caused a short or surge on the board, the damage could be permanent; I do not have enough information to make a solid determination. With nothing but your keyboard, mouse and (one) monitor connected (definitely no USB hub), can you power-on the NUC? There is a green LED on the top of the board (the side that has battery pack attached to it) that indicates if (standby) power is being received from the power supply. Is this LED turning on when you have the unit plugged into the wall? When you hit the power button, for the blower start to spin?
If your NUC has failed, the failure could be in the power supply or in the NUC itself. Regardless, if you NUC is less than three years old, Intel will replace it. If it's older, however, you could try using a replacement power supply (I see Amazon has one for US$12.91: Amazon.com: HQRP AC Power Adapter for Intel NUC Kit D34010WYK/D54250WYK; you can look to see if your local Amazon also carries this item).
If you need to contact Intel Customer Support regarding RMA replacements, here is geographic-specific contact information:
Hope this helps,