I have a NUC 7i5BNK and an issue "dead NUC" appeared from day to day.
I have tried all suggestions below but nothing helped:
1. BIOS Recovery by the Power Button Menu
-> after power button pressed nothing happened
2. BIOS Recovery by the Security Jumper
-> no reaction on power button press
3. Disconnect the power cord from the AC power source for 30 min
-> after assambling everithng togerther pressed power button, but no response
4. Pressed power button for 3-more seconds
-> Nothing helped
5. Removed RAM and HD
-> after pressing power button nothing happens
6. After connection to AC power cord
-> internal led is off
Is there some other suggestion?