So, you are pulling the power cord while the NUC is running the OS?
Sound does not work when you boot the NUC, but the sound always works when you power back on?
There is some contradiction here. Explain in better detail what you are doing and why you abruptly remove the power.
Whenever I first start my computer, the sound doesn't come, but if I shut down the computer, either by turning off the power strip, or just unplugging the power from the back of the computer, while it is running the sound will work after I turn it back on..
you asked "Sound does not work when you boot the NUC, but the sound always works when you power back on?" Yes, the sound works, but not if I properly shut down the computer, only if I shut the power off while it's still running.
To better assist you, we recommend that you continue working this issue on your original thread: https://forums.intel.com/s/question/0D50P00004eXgU9. For this reason, we will close this thread to avoid duplication of effort.
It is worth mentioning that due to Intel® NUC Kit NUC6i3SYH being discontinued, Intel Customer Service no longer supports inquiries for it, but perhaps fellow community members have the knowledge to jump in and help. You may also find the Discontinued Products website helpful to address your request. Thank you for understanding.
Intel Customer Support Technician