I can confirm the same problem. I have a NUC 2820 with FW 28 and am running Debian Jessie. I ran into this problem a couple of days ago, I guess when Jessie moved to 3.14
I had to revert to Linux Kernel 3.13-1-686-pae (i686), (and then remove the 3.14 update in case another update took away 3.13)
Under 3.14 boot would halt after a few lines of text were displayed in the startup routine, and never recover. I am booting from the internal HD, the only USB device is my keyboard/mouse.
I'm not sure how to report this to the Linux developers, but I wonder if that is where we have to go next?