I have been using my NUC for almost a year now, just fine. After working today, I decided to tinker with secure boot and try using it.
I enabled it, signed my bootloader, installed keys and all, and after a reboot, my NUC is completely bricked. It does not output video in any of the parts, does not respond to input from mouse or keyboard, and the power button menu does not come up.
So, I'm left with a paperweight, nothing I found on internet remotely did anything. The only difference was the secure boot setup, there were no updates or changes in software apart from that.
What happened and how do I restore my NUC to working state?
The latest bios is 0059.
The SSD could have made a difference, depending on the bios version, which is why I asked.
Hold the power button on for a full four seconds (not 3, not 5, but 4). It should turn yellow. Release it. Wait. You should see a menu in the upper left corner of your screen.
Do you see the menu? If so, press F2, go into the bios, and turn off Secure Boot.
No lights, no nothing on the front? No lights on the lan ports on the rear?
I am skeptical that turning on Secure Boot would have caused this problem.
Your NUC power brick, and I do not mean to be insulting, is firmly plugged in at both ends? Do you happen to have a multi-meter?
No insult taken, hah. The unit powers on, the LEDs display as usual, including my personal configuration (I changed the skull and power button colors).
I know how to get to the powerbutton menu, and could do it before. Now, the button does turn yellow after pressing it for 4 secs, but nothing appears on screen.
Cables are therefore properly attached, and I made sure to remove all other peripherals, keeping the screen and keyboard (removing keyboard does not help too).
When removing the SSD, it does not change. If it was properly booting, I would expect a message on screen saying that no boot device was found, as is usual.
One thing might be helpful, since I am not using Windows, I have to install my own keys to the UEFI. I did this using the sbctl tool.
Ok, on a usb stick formatted as fat32, put bios 0059 on it. I have attached it.
Then, insert the stick in the bottom right usb port (looking at the nuc from the rear).
Using the power button menu, use F4 and wait to see if the recovery occurs.
Also, again no insult intended, the tv is working, correct?
- Please open your NUC upper cover and remove the Yellow Bios Security Jumper. Remove all devices connected to USB ports (except mouse and keyboard).
- Reconnect the Power Adapter and power ON your NUC. In short time (30 sec - 1min), it will boot into Configuration Menu ) See the attached image.
- Click on  and  to clear all passwords and TPM data.
- Click on F2 to enter Bios.
- Click on F9, followed by "Y", to set Bios defaults and then on F10, followed by "Y" to set default settings and exit from Bios.
- Power down your NUC, remove Power Cord and replace BIOS Security Jumper between pins 1-2.
Before powering ON your NUC (as per para. 2 above), disconnect the CMOS battery connector and reconnect it after 15 minutes (the power cord should be disconnected)
Can someone comment the exact keystrokes to open the BIOS, go to the Boot tab (my NUC opens the Advanced Mode) and toggle the force key reset option? Get me right before Pressing F10 then Y to save settings. Maybe I can blindly do it, but it must be through the keyboard.
Thank you for posting on the Intel® communities.
We cannot effectively guide you into the BIOS if you are getting no display.
If you have a video output over another port, such as DisplayPort, VGA (Video Graphics Array), Mini DisplayPort you might try the suggestions shared in this thread.
We would like to inform you that Linux has not been validated for this model. If any assistance is required using this operating system we encourage you to get assistance using this link.
On the other hand, we found in our support system that we are assisting an issue related to the one described here. Our suggestion would be to continue with the support according to your region through that specific channel.
This thread will be closed. Feel free to post an update or ask additional questions related to this request.
Thank you for contacting Intel!
Intel Customer Support Technician