Thanks for the suggestion. I don't think I would like to open the motherboard, in order not to damage it.
I also opened a ticket in Intel support site, still not response. Can I get an answer from Intel representative please?
Does the NUC make any beep tone when you remove the memory? (You need headphones).
Also, I recommend BIOS recovery.
If you still need assistance, please contact Intel support at: Contact Support
No noise on headphones.
I also tried moving the BIOS jumper to recovery mode - still nothing...
I guess it is just dead, i will wait for the support team, thanks.