Hi. Just started using my nuc but when i try to get in to the bios i only get a big black screen on my 720p TV via hdmi cable.
Otherwise the system is working fine win 8.1 with 4g crucial ram and a mpci samsung 128g ssd.
Check this thread, some similar issues have been discussed Can't access Bios via F2 or Bios Flash via F7, blank screen
I am having the same issue. Very frustrating.
Try updating the BIOS to latest version:
Retrieving data ...