Please download and use this image:http://download.simplemining.net/beta/simpleminer-RX-NV-rc2.img.zipAlso use those settings:

Motherboard settings - MUST HAVE:
1) Make sure you are running the latest BIOS! (you can also try older ones if newest isnt working)
2) Set device to boot from USB/pendrive !
3) Disable Sound audio card !
4) Enable 4G encode !
5) Set PCIe support to Auto or GEN2 !
6) Enable onboard graphics to default (PEG - > IDG)
7) Set also: power ON on AC power lost, disable virtualisation
8) Plug your monitor into the ONBOARD graphics if you want to take a look on boot process