No one knows?
You can check the Power Failure Setting in the BIOS configuration. Under Power tap > Secondary Power Setting > After Power Fails; you can select between:
then press F10 key to save changes
I selected item "Last State" and "Stay Off". The problem is not solved, there is no difference between these items. The item "Power On" is not interesting for some reason.
In the old version of the BIOS it worked fine. I can not remember on which one.
I shutdown Windows 7. The NUC is off. I unplug the power cord.
The next morning I connect the power cord and turn on the NUC power button. The computer is switched on for 3-5 seconds and off itself. Then I turn on the NUC again, the power button, and then it works well.
If I do not disconnect the power cord, NUC always starts with the first press of the power button.
I am not from Intel, but I have noticed the behavior you describe in your latest message on the DN2820FYKH NUC. Like some other people, I plug my PCs into power strip and when the PC has finished shutdown, I then turn off the entire power strip. For this NUC model only (not for many other NUC which I have nor for any previous Intel PC I've had over decades), I have to wait around 5-10 seconds after turning on the power strip before I press the NUC power button on. If I do not wait, then the NUC will act like you describe - it will briefly sort of turn on but then stop - requiring me to press the power button again (after waiting the 5-10 seconds; if you press it again too quickly after the trouble then the problem may repeat).
In older versions of the BIOS it worked fine. I think so, all because of the BIOS new version. Wait for a new BIOS.
I discovered one feature. This occurs when your PC will stay unplugged more than 10-12 hours. If less, then it switched from the first pressing. If you turn off your PC at night and turn on early in the morning, it all works well.
Could you please provide the latest version of the BIOS that is installed on your Intel® NUC DN2820FYKH?
If possible please let us know which was the previous version of the BIOS you were running on your NUC?
Now I have installed version 0051 (latest version). Previously installed version 0021. It seems to me that the problem was not there.
Could you please confirm if issue happens with both versions of the BIOS on your Intel® NUC DN2820FYKH.
Please take into consideration the fact we released a new BIOS Version 0052 - FYBYT10H.86A.0052.2015.0923.1845. BIOS Update [FYBYT10H.86A]
In this version we have made improvements in comparison to Version 0051. I name some:
-Fixed issue in Download Drivers feature where incorrect drivers would display if product was not found in database.
-Fixed issue where monitor wouldn’t wakeup from S3 sleep state.
-Fixed issue where system won’t wakeup from Real Time Clock.
You may get more information here https://downloadmirror.intel.com/25448/eng/FY_0052_ReleaseNotes.pdf
Please try updating to the latest version of the BIOS and post your findings.
I install the new BIOS 0052. I did not have the problems that fixed in the new version. But my problem with power on is not fixed.
Have you tried to check the Power Failure Setting in the BIOS configuration. Under Power tap > Secondary Power Setting > After Power Fails; Here you can select:
Then press F10 key to save changes and exit BIOS.
Please confirm the 3 statuses and post your findings.
Yes, I tried to choose the settings:
"Stay Off", "Power On" and "Last State".
The issue is not gone.