This message was posted on behalf of Intel Corporation
Hi dzsman, We are sorry to hear the NUC is not working properly and we will do our best to try to fix this problem.
Just to let you know, at this point basically you tried all the troubleshoot steps that we recommend for this type of scenario.
Did you make any recent hardware/software changes?
The NUC supports Mini-DP 1.2; Mini-HDMI 1.4a, are you sure you are using the proper cable version?
Just for testing purposes, did you try to use the NUC with just one memory stick at the time with each stick?
Are you able to access the BIOS by pressing F2 several times when you turn the NUC on?
We can also try to remove the hard drive/SSD and test the unit, we should be able to see the splash screen or an error message in regards to a boot error.
You mentioned you tried the BIOS recovery already, on the following link you will find the instructions of how to do it just in case you want to try it again.
Any questions, please let me know.