+ 1 for someone who too is having the same issue, 9 cards okay. As soon as you add a 10th we don't get even to the BIOS option.
I completed all of these options;
http://forum.asrock.com/forum_posts.asp?TID=6589&title=h110-pro-btc-cannot-boot-with-more-than-9-gpu
however nothing...
If anyone find a solution do let us know...
thanks
K