Prior to attempting to install Windows 8.1 (x64) on a new DN2820FYK NUC, and as per Intel's OS installation notes, I undertook a BIOS update via a flash drive containing the latest version available, FY0025.bio. According to the screen display, the update appeared to go ok, but after restarting, there was no longer any display at all.
I have tried the BIOS Recovery procedure (removing the jumper etc) The power led does flash for a few minutes, as if it might be loading something, but then just goes steady-on until the unit is turned off. When re-started, the power light goes on but nothing is displayed, and pressing F2 etc does nothing. I tried the CMOS clearing procedure also, and then BIOS recovery, but still no display. I also reseated the 4gb 1.35v memory module just in case, even though it did not cause a problem when the NUC first booted up to the BIOS it shipped with.
I have subsequently tried the NUC on 3 Panasonic TVs (all of which are XGA (1024x768) capable), a Samsung monitor (also 1024x768 capable), and an LG TV which may or may not be 1024x768 capable. All connections have been by HDMI. I have also tried 3 different HDMI cables, 2 of which at least are 1.4a, and are already used for carrying video and 5.1/7.1 audio from a Core i5 laptop, WD media player and 3D bluray player. I have tried various combinations of cables and TVs, and repeating attempted boot-ups, BIOS recovery, etc. No luck. Apart the initial boot-up and BIOS display, the unit hasn't displayed a thing since the (uninterrupted!) BIOS update.
All up, I have probably wasted about 8 hours so far, not to mention the hours reading forum posts from all over the place. I realise now from the forums that these Haswell NUCs have more than their fair share of BIOS-related problems, but can anyone suggest any other procedures I can try to bring this thing back to life??