Hi,
This product worked perfectly since December 2015 and was connected to a UPS.
The operating system is Windows Professional 8.1.
My NUC is connected to two screens, a Viewsonic analog (VGA) and a Dell digital (HDMI).
HDMI port stopped working during a boot of the NUC, however the VGA port still worked.
I tested the HDMI screen on another machine, it was OK.
I've updated the graphics driver, still no HDMI.
I tested the material with your diagnostic software:
Everything was OK.
In the BIOS, the priority of the screens were on automatic.
So I changed it in screen 1: HDMI and screen 2: VGA.
When you start more no screen didn't work.
After several starts, the keyboard no longer lights and no mouse.
Power LED is stable and the fan in spinning.
I tested these four devices on another machine, all are functioning normally.
I think in maybe a BIOS problem that escalates.
I'm looking for a procedure that allows you to reinstall the BIOS without keyboard or screen?
Then, I only see the hardware problem.
If anyone has a solution...
Thanks in advance to you all.