Just a heads up with those using 4K monitors with the Intel NUC6i7KYK with an HDMI cable.
When the Intel NUC 6i7KYK was connected to a 4K monitor using the HDMI cable, two things happened.
Things that do not work:
Fix (things that work):
Hope this helps someone.
Thank you for posting on the Intel® communities.
First of all, we would like to thank you for the great troubleshooting steps provided and taking the time to share this steps with us.
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Intel Technical Support Technician