Please let me know if the power button is changing of color from red or white to blue when you press and release the button.
If the light is not changing, I suggest you to get in touch with Contact Support
Give a try using 1 memory stick.
Hi NukedNUC, let me guess, are you a Linux user? Your situation sounds very similar to my NUC5I7RYH. I was able to boot my NUC again after opening it up, removing the motherboard, and resetting the CMOS battery as suggested by Ozzy in this thread: Intel NUC i7 is a brick, HELP!!