Thanks for the thoughts. As I stated in the original post, "I tried each of these suggestions with 2 separate power adapters."
One of the two came with the nuc, and the other is a duplicate I ordered directly from intel. Both are listed as 19V. I don't have the means of testing that, but both have functioned fine for the past year.
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Sorry, I didn't see your remark about the two power adapters.
If you didn't yet, please try the following:
1. Connect the power adapter directly to your NUC, without using any surge protector (I'm assuming that you have verified that there is a power in the wall outlet).
2. Connect some cellphone to the yellow charging USB socket (on NUC front panel). Check if your phone is charging.
3. If your phone is not charging (assuming that your power adapter is OK and in the Bios setting charging trough USB port was not disabled), probably power circuit in your NUC is damaged and you shall replace your NUC (you have three years of warranty service).