Intel NUC fails to power on via BIOS while fans operate at maximum speed.
Intel NUC fails to power on via BIOS while fans operate at maximum speed.
I recently got a few Intel NUC7i3BNB units and noticed four of them are experiencing the same issue. The problem starts when you connect the power adapter: the front LED and power button flash blue right away, then the fan runs at full speed for a few minutes before shutting off. After 15 to 30 seconds it restarts the cycle. My mouse and keyboard stop working, and there’s no display on the monitor. These units have been stored for months. I’ve tried various RAM types, different RAM settings, removed the CMOS battery for five minutes, and reconnected everything. Checked all boards for damage or missing parts. I followed the official BIOS update from ASUS (April 1, 2025) and used a security jumper and power button reset method. This is my final attempt, so please let me know if anyone has advice.
Yes, you can use a multimeter to test the CMOS battery. It helps verify if the power supply is stable and the battery is functioning properly.
Some of the NUCs take time to activate and the fans also lag initially, but eventually they reach full speed again.