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Thank you for joining this community.
I understand that you want to inquire into the LED behavior of the power button on your Intel® NUC Kit NUC8i7HVk
In this case, you can take a look into the product specification sheet, page 58 and 59 for information regarding the LED Light status and behavior:
In addition, if you experience any issues, this article will show you the most common behavior of the LED light and how to perform troubleshooting in case that is necessary:
I hope this helps, please let me know if you have any other question or concern.