This message was posted on behalf of Intel Corporation
Skywalker0175: Thank you very much for joining the Intel® NUC communities. We are sorry to hear the NUC is not booting anymore.
In order to try to fix this problem, we can try to test the NUC with minimal configuration, just with one memory stick at the time, no Hard drive/SSD, just the keyboard and mouse, without any other device. That way we should get the splash screen or a booting error message.
If the problem persists, we can also try to clear CMOS:
Which video port on the NUC are you using?
Which Windows version are you using?
Remember that the warranty that Intel provides on the NUC is for 3 years.
Any further questions, please let me know.