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Hi WW6302: Thank you very much for joining the Intel® NUC communities.
Just for testing purposes, do you have the option to use another HDMI cable?
We can try to re-install the chipset and management engine drivers:
We can also try a BIOS update to the latest version, on the link below you will find the instructions to do the BIOS update using the F7 method and the .BIO file needed:
.BIO version 0046:
Please let me know the results of trying the steps above.
Any further questions, please let me know.