I didn't connect any HDD/SSD to my mobo, so there is no driver version.
I just connected simply a direct HDMI cable from the on board hdmi port to the ASUS HD monitor(not 4K) without any adapters. I have also tried with different hdmi cables and moniotrs, but all in vain.
Thanks for help.
If you took the processor back to the vendor and they tested the graphics controller with the HDMI port as well, this seems to be an issue with the motherboard itself, the cable you are using on this motherboard or the video port on the computer.
I also have ASUS Z170-Deluxe and 6700K and I have the same trouble with HDMI at my 4k montor.
Sometimes with HDMI the screen turns black, very often I get "no signal" on my monitor when windows 10 is starting.
With Display Port there are no issues.
This problem is very new. Maybe it was a windows 10 update or a driver issue of the intel 530.
I have uinstalled both intel driver win64_220.127.116.1124 and also win64_18.104.22.16844 (beta).
With original windows 10 driver #4377 I have no more black flashes or issues that the screen remains black. Sometimes when windows starts the screen is greenish, but this goes away after login.