CPU–LED = your cpu or socket is there problem
DRAM = memory
VGA = video card( already discarded as a problem)
BOOT DEV= some other thing...
Post a picture of the top right corner of your motherboard after trying to boot it...
There are 1.2v and 1.35v DDR4 memories for sale...
Does any one knows if the DDR4 memory voltage influences on the overclocking capability of a Skylake or Kabylake chip?
Any one that looks good on your build... I don't think the quality or performances are much different...
Many reviews and YouTube videos can confirm that...
I have an ASUS z170 pro gaming. I am very satisfied. My 6700k is stable at 4.6ghz.
Ramcache and fanexpert are 2 nice softwares that come with the board.