Hi,
I am facing the exact problem like you!!!
With 9x vegas it´s running nice, but when I connect 10x nothing happend. I am not even able to boot inside bios. Monitor is off and thats all...
I am was contacting asrock support few times, they are told me lots of sh..s, but at the end, they are sent me a new bios for mobo. Unfortunatelly I am was unable to try it because the rig is in remote area...
If you want to try, I can send it to you.