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I suggest doing a BIOS recovery; you can follow the steps here:
You can download the latest BIOS version at the following link:
After that is done make sure UEFI and legacy boot are enabled, disabled network boot “Legacy PXE” if it is enabled.
Disable secure boot if it enabled and under devices on the SATA tab you will see an option for “Hard Disk Pre-Delay” move the scroll bar to 5.
I hope this can help you, if not I suggest contacting support to get a replacement for the unit.
Downloaded the latest BIOS and followed the steps to recover. Issue persists. Reset BIOS settings to factory then made sure that UEFI and legacy boot were enabled and disabled network boot. Secure boot not enabled and Hard Disk Pre-Delay set to 5. Error I get when attempting to boot to Win 7 is "Reboot and Select proper Boot device". The SSD is the only boot device listed in the BIOS.
Please check to see if it is connected correctly, sometimes they can be loose and that can cause this problem.
If that does not work, try formatting the driver and delete any partition available.
If it is possible try another hard drive.
The SSD shows up in the BIOS so it's not loose. It just wont boot to it. Also tried to reformat the SSD and start from scratch. Have already tried another SSD as well. Tried a Samsung 250GB m.2 SSD and a Transcend 64GB m.2 SSD. I will try and use the SSD in another NUC device when I have one available.
Tested the SSD in a known good NUC of the same kind and it booted fine.
At this point I recommend replacing the unit; you can submit a request at the following link: