I'm in a similar boat except I'm running a new nv920x macro card, and my cameras are RCA instead of coax
Same thing like I said, blank screen on PC and I know cameras are good.
Software installed fine, driver appeared to install fine. I would get different software but it seems rather proprietary with that mv9200 chipset
Do you have aim? Wanting to get this fixed tonight, maybe we can bounce ideas off each other.