There are 5 newer BIOS updates since version 0037.
If problem continues, let me know which the current operating system is running on your device. Are you using the default BIOS settings?
I run Windows 8.1 (see my original message).
I am not using the BIOS defaults for power settings. I have the BIOS set to auto power on when power is applied, because I do not have access to the power button in my application. This works in 0037. When I load the latest 0046, this no longer works. I apply power, the white LED comes on for about one second, then goes off again.
Which of the five newer BIOS versions properly supports auto power on after power loss? 0046 obviously does not.
I did a test using the same motherboard DE3815TYBE, latest BIOS 0046. I get into the BIOS>Advanced>Power and change the setting of the After Power Failure to “Power On”. Saved changes with F10, restarted and booted to Windows® 8.1 Pro 64bit.
Then, I removed the power cord from the NUC (still on) wait 2 minutes and reconnected the power and NUC went to Windows® 8.1 again. I did the same test after 8 minutes and after 25 minutes without any issue.
Please try to reinstall the latest BIOS 0046 with the recovery option, it is necessary to remove the BIOS jumper and download the .BIO file of the BIOS.
BIOS Recovery Update Instructions
Thank you for taking the time to test my scenario. I think the difference is that I do not just remove power while Windows is running (aka power fail). I initiate an orderly shutdown, then once properly shut down, I remove the power. If I then re-apply power, with 0037 the system powers on fully. With 0046 the white LED comes on for a second, then goes off.
I will keep my system at 0037. Thanks for your help.