BIOSTAR TB350-BTC issues?

any help for a noob would be greatly appreciated. im perhaps in a little over my head here, ive built a pc before with no issues, but this is my first mining rig.
ive got everything set up and powered up and looking like its working but i cant get any signal from the GPU to monitor thru HDMI
there is nothing installed on the rig apart from a hiveos flash image on the ssd. tried it remotely from my main pc thru hive but i cant connect.

any ideas please? does my MB work with hiveos or do i need windows?
ive ordered a DVI cable from amazon so ill try plugging straight into MB tomorrow and see if that gets me to the bios at least